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Facharzt FMH Hals-Nasen-Ohren - independent subject foundations study materials
Facharzt FMH Hals-Nasen-Ohren - independent subject foundations study resources

Facharzt FMH Hals-Nasen-Ohren - independent subject foundations practice questions

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Question 1Otology, neurotology and audiological interpretation

During a tympanomastoidectomy for chronic suppurative otitis media, the surgeon encounters complete necrosis of the long process and lenticular process of the incus, but the stapes superstructure (head, crura) is intact, healthy, and mobile. The malleus handle is present and mobile. What type of ossicular reconstruction is indicated to achieve optimal acoustic coupling?

  1. Total Ossicular Replacement Prosthesis (TORP) placed from the footplate to the tympanic membrane
  2. Complete removal of the stapes superstructure followed by stapedotomy piston placement
  3. Static bone cement obliteration of the oval window niche
  4. Partial Ossicular Replacement Prosthesis (PORP) or autologous incus interposition graft placed between the stapes head and the malleus handle/tympanic membrane Correct answer.

Explanation

When the stapes superstructure (arch) is intact and mobile, a Partial Ossicular Replacement Prosthesis (PORP) or sculpted incus interposition graft is placed between the stapes capitulum and the malleus handle/tympanic membrane. A Total Ossicular Replacement Prosthesis (TORP) is reserved for situations where the stapes superstructure is absent and only a mobile footplate remains.

Question 2Otology, neurotology and audiological interpretation

A 60-year-old male presents with severe deep right ear pain, ipsilateral complete facial weakness (House-Brackmann V), vertigo, and sensorineural hearing loss. Otoscopy reveals clustered erythematous vesicles and crusting over the right concha, external auditory canal, and postauricular sulcus. What is the diagnosis, and what is the optimal first-line pharmacotherapy?

  1. Ramsay Hunt syndrome (Herpes Zoster Oticus); combination oral valacyclovir/acyclovir plus high-dose oral corticosteroids Correct answer.
  2. Bell's palsy; oral amoxicillin alone for 7 days
  3. Malignant melanoma of the external ear; wide local excision with sentinel node biopsy
  4. Acute bullous myringitis; topical antibiotic drops without systemic therapy

Explanation

Ramsay Hunt syndrome (herpes zoster oticus) is caused by reactivation of varicella-zoster virus (VZV) in the geniculate ganglion. The classic triad consists of: 1) severe otalgia, 2) cutaneous/auricular vesicular eruptions (in the sensory distribution of CN VII/intermediate nerve), and 3) peripheral facial nerve palsy, often with vestibulocochlear involvement (CN VIII). Combined early treatment (within 72 hours) with high-dose oral corticosteroids and an antiviral agent (valacyclovir 1000 mg TID or acyclovir) significantly improves facial nerve recovery rates compared to steroids alone.

Question 3Otology, neurotology and audiological interpretation

During stapes surgery for presumed otosclerosis in an 18-year-old male with mixed hearing loss, the surgeon makes a small micro-puncture into the stapedial footplate. Immediately, a profuse, high-pressure, clear fluid 'gusher' wells up into the middle ear, rapidly filling the canal and overflowing the speculum. What congenital anomaly and genetic mutation are most strongly associated with this surgical emergency?

  1. Branchio-oto-renal (BOR) syndrome with EYA1 mutation
  2. Congenital X-linked gusher syndrome (DFNX2) with POU3F4 mutation causing a wide communication between the internal auditory canal (IAC) and the cochlear basal turn Correct answer.
  3. Treacher Collins syndrome with TCOF1 mutation causing middle ear ossicular fusion
  4. Waardenburg syndrome type 1 with PAX3 mutation causing strial atrophy

Explanation

A stapes gusher is an intraoperative emergency caused by abnormal wide patency/dehiscence of the bony lamina cribrosa at the fundus of the internal auditory canal, allowing direct transmission of high-pressure cerebrospinal fluid (CSF) into the perilymphatic space. The classic inherited form is X-linked gusher syndrome (DFNX2), caused by mutations in the POU3F4 gene. Preoperative temporal bone CT reveals bulbous dilation of the fundus of the IAC and absence of the modiolus/cribriform base.

Question 4Otology, neurotology and audiological interpretation

A 22-year-old male with Neurofibromatosis Type 2 (NF2) has bilateral large vestibular schwannomas (Koos Grade IV). He undergoes resection of the larger right-sided tumor, during which the cochlear nerve is non-functional and anatomically disrupted. He is scheduled for left-sided tumor resection in the future and faces total bilateral sensorineural deafness. What auditory rehabilitation device can be implanted directly onto the cochlear nuclei in the lateral recess of the fourth ventricle?

  1. Bilateral Bone-Anchored Hearing System (BAHS)
  2. Contralateral conventional Cochlear Implant (CI)
  3. Auditory Brainstem Implant (ABI) Correct answer.
  4. Middle Ear Transducer Implantation (Vibrant Soundbridge)

Explanation

The Auditory Brainstem Implant (ABI) is specifically designed for patients with non-functional or anatomically transected cochlear nerves, predominantly individuals with Neurofibromatosis type 2 (NF2) undergoing vestibular schwannoma resection. The electrode paddle is surgically positioned within the lateral recess of the fourth ventricle (foramen of Luschka) to directly stimulate the dorsal and ventral cochlear nuclei.

Question 5Otology, neurotology and audiological interpretation

A 32-year-old male with bilateral congenital external auditory canal atresia and microtia has normal inner ear cochlear function on both sides (bone-conduction thresholds 10–15 dB HL bilaterally). Conventional behind-the-ear air-conduction hearing aids cannot be fitted due to absence of ear canals. What is the most appropriate hearing rehabilitation device for this patient?

  1. Bone-Anchored Hearing System (BAHS / Baha) or active transcutaneous bone conduction implant (e.g., Bonebridge) Correct answer.
  2. Bilateral Cochlear Implantation via round window approach
  3. Auditory Brainstem Implantation via retrosigmoid approach
  4. Deep insertion canal-in-the-ear (CIC) hearing aids

Explanation

In patients with bilateral congenital external auditory canal atresia and excellent bone-conduction thresholds (cochlear reserve ≤45–55 dB HL), a bone-anchored hearing system (BAHS) or active transcutaneous bone conduction implant (such as the Bonebridge) bypasses the atretic external and middle ear by directly vibrating the skull to stimulate both cochleae, providing outstanding auditory outcomes.

Question 6Otology, neurotology and audiological interpretation

A 35-year-old woman undergoes diagnostic audiological testing for progressive bilateral conductive hearing loss. Tympanometry demonstrates normal middle ear peak pressure (0 daPa), a normal ear canal volume (1.1 mL), but a markedly reduced static peak acoustic admittance/compliance (0.15 mL, Jerger Type As tympanogram). Acoustic reflexes are absent bilaterally. Which pathology is most classic for a Jerger Type As tympanogram?

  1. Stapedial otosclerosis (or tympanic membrane / ossicular stiffness) Correct answer.
  2. Eustachian tube dysfunction with significant negative middle ear pressure
  3. Middle ear effusion (serous otitis media)
  4. Ossicular chain discontinuity / incus-stapes joint dislocation

Explanation

In the Jerger tympanometric classification: Type As (A-shallow/stiff) is characterized by normal peak pressure (-100 to +50 daPa) but pathologically reduced compliance (<0.2–0.3 mL), reflecting increased stiffness of the tympano-ossicular system, classic for otosclerosis or tympanosclerosis.

Question 7Rhinology, skull-base boundaries and allergic disease

A 68-year-old male on antiplatelet therapy for coronary artery disease presents with severe, persistent posterior epistaxis that fails to stop despite anterior nasal packing and posterior balloon tamponade. Nasal endoscopy after pack removal shows active arterial bleeding emerging from the posterior aspect of the middle meatus just posterior to the crista ethmoidalis. What is the surgical gold-standard procedure of choice to control this arterial hemorrhage?

  1. Endoscopic transnasal sphenopalatine artery (SPA) ligation/cauterization at the sphenopalatine foramen Correct answer.
  2. External carotid artery ligation in the neck via a transcervical approach
  3. Anterior ethmoidal artery ligation via a Lynch frontoethmoidal incision
  4. Blind anterior and posterior gauze packing left in place for 14 days

Explanation

Over 90% of severe posterior epistaxis arises from branches of the sphenopalatine artery (SPA, a terminal branch of the maxillary artery). Endoscopic transnasal sphenopalatine artery ligation/cauterization (ESPAL) at the sphenopalatine foramen (located immediately posterior to the crista ethmoidalis on the lateral nasal wall) has success rates >95%, shorter hospital stay, and lower morbidity compared to prolonged posterior packing or open carotid ligation.

Question 8Rhinology, skull-base boundaries and allergic disease

Following endoscopic endonasal transsphenoidal/transcribriform resection of an anterior skull base olfactory neuroblastoma, a 2.5 cm high-flow CSF leak with a large dural defect is present. To achieve durable vascularized skull base reconstruction and prevent postoperative meningitis, the surgeon harvests a Hadad-Bassagasteguy pedicled nasoseptal flap. Which artery provides the primary vascular supply to this flap?

  1. Anterior ethmoidal artery
  2. Greater palatine artery
  3. Posterior septal branch of the sphenopalatine artery (SPA) Correct answer.
  4. Superior labial artery branch to the columella

Explanation

The Hadad-Bassagasteguy nasoseptal flap is a pedicled mucoperiosteal flap harvested from the nasal septum based on the posterior septal branches of the sphenopalatine artery. It provides a robust, large, pliable vascularized tissue bed that has dramatically reduced postoperative CSF leak rates (<5%) following expanded endoscopic skull base reconstructions.

Question 9Rhinology, skull-base boundaries and allergic disease

During an endoscopic anterior ethmoidectomy, the surgeon accidentally lacerates the anterior ethmoidal artery at its entry through the lamina papyracea. The vessel retracts into the intraorbital space. Within minutes, the patient's ipsilateral eye develops progressive proptosis, tense rock-hard globe to palpation, and a dilated, unreactive pupil with intraocular pressure (IOP) measured at 52 mmHg (normal 10–21 mmHg). What is the immediate, life-saving bedside surgical intervention of choice?

  1. Immediate urgent orbital MRI followed by elective ophthalmology consult the next morning
  2. Bilateral anterior nasal packing with petroleum gauze to compress the medial orbit
  3. Continuous high-pressure bag-valve-mask ventilation with 100% oxygen
  4. Emergency lateral canthotomy and inferior cantholysis at the bedside / in the OR to decompress the orbit Correct answer.

Explanation

A retrobulbar (intraorbital) hematoma resulting from anterior ethmoidal artery retraction is a surgical emergency. The rapidly accumulating blood inside the unyielding bony orbit causes orbital compartment syndrome, causing central retinal artery occlusion and irreversible ischemic optic neuropathy within 60–90 minutes if untreated. Emergency bedside lateral canthotomy with inferior cantholysis releases the lower eyelid and immediately decompresses intraorbital pressure.

Question 10Rhinology, skull-base boundaries and allergic disease

A 44-year-old female presents with clear, watery, unilateral discharge from her right nostril that started 3 weeks after a minor road traffic collision. The fluid increases when she bends forward or strains (reservoir sign). She notes a sweet or salty metallic taste in the back of her throat. What is the most sensitive and specific non-invasive laboratory test to confirm that the collected nasal drainage is cerebrospinal fluid (CSF)?

  1. Glucose test strip (dipstick) analysis of nasal secretions
  2. Beta-2 transferrin (or beta-trace protein / prostaglandin D2 synthase) immunofixation electrophoresis Correct answer.
  3. Total protein concentration measurement of the fluid
  4. Measurement of nasal fluid chloride and potassium ions

Explanation

Beta-2 transferrin is a useful highly specific marker when evaluating collected fluid for a CSF leak, with attention to relevant test and specimen limitations. Beta-trace protein is another marker assessed through its own validated laboratory method; it should not be described as the same immunofixation assay. A result is interpreted with the clinical and imaging assessment.

Question 11Rhinology, skull-base boundaries and allergic disease

During functional endoscopic sinus surgery, the surgeon is operating in the posterior ethmoid cavity. On coronal and axial CT scans, the most posterior ethmoid cell is noted to pneumatize superiorly and laterally to the sphenoid sinus, surrounding the optic canal. What is this specific anatomic variant called, and what vital structure is at high risk of iatrogenic transection during instrumentation within this cell?

  1. Haller cell (infraorbital ethmoid cell); infraorbital nerve
  2. Agger nasi cell; lacrimal sac
  3. Onodi cell (sphenoethmoidal cell); Optic nerve (CN II) and/or Internal Carotid Artery (ICA) Correct answer.
  4. Torres cell; maxillary artery

Explanation

An Onodi cell (sphenoethmoidal cell) is a posterior ethmoid cell that pneumatizes posteriorly, superiorly, and laterally to the anterior face of the sphenoid sinus. In the presence of an Onodi cell, the optic nerve (and occasionally the internal carotid artery) runs directly along or dehiscent within the lateral wall of the ethmoid cell rather than being protected inside the sphenoid sinus. Failure to recognize this variant on CT can lead to catastrophic optic nerve transection and permanent blindness during posterior ethmoidectomy.

Question 12Rhinology, skull-base boundaries and allergic disease

A 42-year-old female with severe, recalcitrant chronic rhinosinusitis with bilateral nasal polyps (CRSwNP) and severe asthma presents after developing acute bronchospasm, severe rhinorrhea, and facial flushing 45 minutes after taking 500 mg of oral ibuprofen for a headache. What is this clinical triad called, and what is the underlying biochemical disturbance?

  1. Kartagener's syndrome; mutation in dynein arms causing primary ciliary dyskinesia
  2. Churg-Strauss syndrome (EGPA); anti-MPO ANCA autoimmune necrotizing vasculitis
  3. Aspirin-Exacerbated Respiratory Disease (AERD / Samter's triad / Widal's syndrome); inhibition of COX-1 shifting arachidonic acid metabolism to the 5-lipoxygenase pathway with massive cysteinyl leukotriene overproduction Correct answer.
  4. Cystic fibrosis; CFTR channel dysfunction leading to abnormal thick mucus

Explanation

Aspirin-Exacerbated Respiratory Disease (AERD, historically Samter's triad or Widal's syndrome) consists of: 1) Asthma, 2) Chronic rhinosinusitis with nasal polyps, and 3) Hypersensitivity reactions to aspirin and other non-selective COX-1-inhibiting NSAIDs. Ingestion of COX-1 inhibitors suppresses PGE2 synthesis, causing profound dysregulation of arachidonic acid metabolism and massive upregulation of the 5-lipoxygenase pathway, leading to hypersecretion of cysteinyl leukotrienes (LTC4, LTD4, LTE4).

Question 13Rhinology, skull-base boundaries and allergic disease

A 31-year-old male suffers from recurrent acute left maxillary sinusitis. Coronal CT shows an anatomical variation consisting of an anterior ethmoid air cell pneumatizing inferiorly into the medial aspect of the orbital floor, forming part of the superior margin of the maxillary sinus ostium and narrowing the ethmoidal infundibulum. What is the name of this anatomical variant?

  1. Agger nasi cell
  2. Haller cell (infraorbital ethmoid cell) Correct answer.
  3. Onodi cell
  4. Concha bullosa of the superior turbinate

Explanation

A Haller cell (infraorbital ethmoid cell) is an ethmoid air cell that pneumatizes along the medial orbital floor and roof of the maxillary sinus, immediately lateral to the ethmoid infundibulum. When enlarged or infected, it significantly narrows or obstructs the ethmoid infundibulum and maxillary sinus ostium, predisposing to recurrent ipsilateral maxillary sinusitis.

Question 14Rhinology, skull-base boundaries and allergic disease

During an extended endoscopic endonasal approach to the sphenoid sinus and sella turcica, the surgeon identifies key anatomical landmarks along the lateral sphenoid wall. What is the anatomical structure located in the lateral wall of the sphenoid sinus directly between the optic canal superiorly and the internal carotid artery prominence inferiorly?

  1. Vidian canal
  2. Foramen ovale containing the mandibular nerve (V3)
  3. Pterygopalatine ganglion
  4. Lateral Opticocarotid Recess (OCR / lateral OCR) Correct answer.

Explanation

The Lateral Opticocarotid Recess (lateral OCR) corresponds to the pneumatization of the optic strut (the inferior root of the lesser wing of the sphenoid bone) on the lateral wall of the sphenoid sinus. It is an indispensable surgical landmark located directly between the optic canal superiorly and the paraclinoid/cavernous internal carotid artery prominence inferiorly, providing a reliable entry pathway to the optic canal, anterior clinoid process, and cavernous sinus.

Question 15Rhinology, skull-base boundaries and allergic disease

An 82-year-old hypertensive female presents with persistent, slow venous bleeding flowing down the posterior pharynx from the posterior lateral nasal wall inferior to the posterior tip of the inferior turbinate. Anterior rhinoscopy shows no bleeding from Kiesselbach's plexus. What is the name of this posterior venous plexus located on the lateral nasal wall inferior to the inferior turbinate?

  1. Woodruff's plexus Correct answer.
  2. Kiesselbach's (Little's) plexus
  3. Batson's venous plexus
  4. Pampiniform plexus

Explanation

Woodruff's plexus is a prominent venous plexus located on the posterior lateral nasal wall inferior and posterior to the posterior end of the inferior turbinate. It is a frequent site of posterior venous epistaxis in elderly, hypertensive, and arteriosclerotic patients.

Question 16Voice, laryngeal function, airway and sleep

A 52-year-old woman presents with an involuntary strained, strangled, effortful voice characterized by pitch breaks and voice arrests during connected speech, especially when producing voiced vowel-heavy sentences ('We eat eight eggs every day'). When she whispers, sings, or laughs, her voice sounds completely normal. Flexible laryngoscopy reveals intermittent, involuntary adductor spasms of the true vocal folds during phonation. What is the diagnosis and gold-standard treatment?

  1. Abductor spasmodic dysphonia; injection of botulinum toxin into the posterior cricoarytenoid (PCA) muscle
  2. Adductor Spasmodic Dysphonia (ADSD); electromyography-guided Botulinum Toxin A injection into the Thyroarytenoid (TA) muscle complex Correct answer.
  3. Muscle tension dysphonia (MTD); permanent vocal fold fat injection
  4. Vocal fold leukoplakia; microscopic laser stripping

Explanation

Adductor Spasmodic Dysphonia (ADSD) is a focal task-specific laryngeal dystonia causing involuntary hyperadduction of the vocal folds, resulting in a characteristic strained-strangled voice with breaks during voiced vowels. Reflexive tasks (laughing, singing, whispering) are spared. The gold-standard therapy is periodic EMG-guided injection of Botulinum Toxin A (Botox) into the thyroarytenoid / vocalis muscle complex, which temporarily reduces muscle spasm and restores fluent voice for 3–6 months.

Question 17Voice, laryngeal function, airway and sleep

An ENT phoniatrician performs a Fiberoptic Endoscopic Evaluation of Swallowing (FEES) in a 68-year-old post-stroke patient with dysphagia. What clinical findings and advantages can be directly evaluated by FEES that are not provided by a Videofluoroscopic Swallowing Study (VFSS / modified barium swallow)?

  1. Assessment of the esophageal phase of swallowing and lower esophageal sphincter relaxation
  2. Measurement of gastric emptying rates and acid clearance
  3. Detection of subdiaphragmatic hiatal hernias
  4. Direct visualization of laryngeal and vocal fold anatomy/mobility, mucosal sensation, pharyngeal secretions/pooling, and real-time biofeedback testing of compensatory postures at the bedside without radiation exposure Correct answer.

Explanation

FEES provides direct assessment of pharyngeal and laryngeal anatomy, secretions, movement and relevant responses at the bedside without ionizing radiation. Sensory assessment depends on the method used, and the brief white-out during the pharyngeal swallow limits direct visualization of that instant. FEES and VFSS offer complementary information; neither is a universal replacement for the other.

Question 18Voice, laryngeal function, airway and sleep

A 26-year-old primary school teacher presents with chronic hoarseness that worsens at the end of the school week. Videolaryngostroboscopy demonstrates small, bilateral, symmetric, whitish fibrous swellings located at the junction of the anterior one-third and posterior two-thirds of the true vocal folds. What is the most appropriate initial management?

  1. Voice therapy with an experienced speech-language pathologist and vocal hygiene measures Correct answer.
  2. Immediate bilateral microlaryngeal excision with cold steel instruments
  3. Botulinum toxin injection into the thyroarytenoid muscles bilaterally
  4. External beam radiotherapy to both true vocal folds

Explanation

Vocal fold nodules (singers' or teachers' nodes) are bilateral, symmetric lesions located at the midpoint of the membranous vocal fold (junction of anterior 1/3 and posterior 2/3), the site of maximum vibratory collision forces. Initial management is always conservative voice therapy to eliminate hyperfunctional phonotrauma, which cures or substantially improves the majority of cases.

Question 19Voice, laryngeal function, airway and sleep

A 40-year-old singer experiences acute dysphonia following an episode of intense coughing and vocal strain. Videostroboscopy reveals a unilateral, translucent, pedunculated gelatinous mass on the free edge of the middle third of the right true vocal fold that flops into the glottis during phonation. What is the most likely diagnosis?

  1. Laryngeal contact granuloma
  2. Vocal fold polyp Correct answer.
  3. Reinke's edema
  4. Intracordal epidermoid cyst

Explanation

Vocal fold polyps are typically unilateral, gelatinous or angiomatous lesions with a pedunculated or sessile base located at the mid-membranous vocal fold. They often develop acutely after an episode of severe phonotrauma or mucosal hemorrhage in Reinke's space.

Question 20Voice, laryngeal function, airway and sleep

A 52-year-old woman with a 35-pack-year smoking history presents with progressive vocal deepening, masculine pitch, and exertional dyspnea. Direct laryngoscopy shows diffuse, bilateral, symmetric pale gelatinous expansion of the entire superficial lamina propria causing the vocal folds to balloon out. What is this clinical entity?

  1. Glottic squamous cell carcinoma in situ
  2. Recurrent respiratory papillomatosis
  3. Reinke's edema (polypoid corditis) Correct answer.
  4. Laryngeal amyloidosis

Explanation

Reinke's edema (polypoid corditis) is characterized by diffuse accumulation of thick gelatinous fluid within the superficial lamina propria (Reinke's space). It is strongly associated with long-standing cigarette smoking, voice abuse, and hypothyroidism, typically presenting with an abnormally low vocal pitch and occasional airway obstruction.

Question 21Voice, laryngeal function, airway and sleep

A 45-year-old male with chronic severe gastroesophageal reflux and throat clearing presents with persistent foreign body sensation and hoarseness. Laryngoscopy reveals an exophytic, lobulated, fleshy lesion over the vocal process of the left arytenoid cartilage. What is the initial, evidence-based management strategy for this lesion?

  1. Immediate wide laser cordectomy of the posterior glottis
  2. External beam radiation therapy of 40 Gy to the posterior glottis
  3. Tracheostomy and absolute voice rest for 6 months
  4. High-dose proton pump inhibitor therapy, antireflux lifestyle modifications, and speech therapy Correct answer.

Explanation

Vocal process contact granulomas arise over the cartilaginous glottis due to mucosal breakdown from acid reflux, habitual throat clearing, or endotracheal intubation. Because surgical excision carries a high recurrence rate (>60-80%), primary conservative management with high-dose PPIs, behavioral voice therapy, and reflux control is the standard of care.

Question 22Voice, laryngeal function, airway and sleep

A 48-year-old woman presents with a breathy, weak voice and coughing on swallowing thin liquids 2 weeks after an uneventful total thyroidectomy. Flexible laryngoscopy shows the left vocal fold immobilized in the paramedian position. What is the recommended management timeline before considering permanent medialization thyroplasty?

  1. Observation and voice therapy for 6 to 12 months to allow potential spontaneous neural recovery Correct answer.
  2. Immediate permanent silastic medialization thyroplasty within 72 hours
  3. Urgent neck exploration and nerve grafting within 14 days
  4. Endoscopic posterior cordotomy and lateralization within 1 month

Explanation

Recovery of a potentially injured laryngeal nerve can occur over months, so the timing of a permanent framework procedure depends on the actual prognosis and course. Observation and voice therapy do not mean ignoring swallowing or aspiration risk; temporary augmentation or other support may be appropriate earlier. The full patient-specific assessment governs the plan.

Question 23Voice, laryngeal function, airway and sleep

Immediately following extubation after total thyroidectomy for retrosternal goiter, a patient develops severe inspiratory stridor, intercostal retractions, and cyanosis, but retains a clear, nearly normal voice. What clinical entity does this scenario indicate, and what is the underlying mechanism?

  1. Unilateral recurrent laryngeal nerve palsy resulting in glottic incompetence
  2. Bilateral recurrent laryngeal nerve injury with both vocal folds paralyzed in the paramedian position Correct answer.
  3. Bilateral superior laryngeal nerve transection causing cricothyroid spasm
  4. Acute hypocalcemic tetany inducing severe laryngospasm

Explanation

Bilateral recurrent laryngeal nerve paralysis leaves both vocal folds immobilized near the midline (paramedian position) due to the unopposed adductor action of the cricothyroid muscles (innervated by the superior laryngeal nerves). This creates critical glottic airway obstruction with severe stridor, while voice quality remains deceptively clear because the folds are closely approximated.

Question 24Voice, laryngeal function, airway and sleep

A professional operatic soprano complains of vocal fatigue, breathiness, and inability to reach high musical pitches (loss of upper register) following anterior cervical discectomy and fusion. Stroboscopy demonstrates vocal fold bowing with an oblique, asymmetrical glottis during high-pitch phonation. Injury to which nerve explains these findings?

  1. Recurrent laryngeal nerve
  2. Internal branch of the superior laryngeal nerve
  3. External branch of the superior laryngeal nerve (EBSLN) Correct answer.
  4. Hypoglossal nerve

Explanation

The external branch of the superior laryngeal nerve (EBSLN) innervates the cricothyroid muscle, which tilts the thyroid cartilage forward to elongate, tense, and thin the vocal folds for high-pitch phonation. EBSLN palsy causes loss of vocal tension, pitch limitation, and vocal fatigue with an oblique glottis pointing toward the paralyzed side during phonation.

Question 25Voice, laryngeal function, airway and sleep

A 44-year-old attorney presents with a strained, strangled, effortful voice with frequent pitch breaks and spasms that are most pronounced when articulating voiced vowels (e.g. 'we eat eight eggs daily'). What is the definitive first-line therapeutic intervention for this neurological focal dystonia?

  1. High-dose systemic baclofen and trihexyphenidyl
  2. Bilateral complete recurrent laryngeal nerve avulsion
  3. Medialization thyroplasty type I
  4. Intramuscular botulinum toxin A injection into the thyroarytenoid / lateral cricoarytenoid muscle complex Correct answer.

Explanation

Adductor spasmodic dysphonia is a task-specific focal laryngeal dystonia causing intermittent hyperadduction spasms during phonation. Botulinum toxin A injection into the thyroarytenoid muscle under EMG or endoscopic guidance induces temporary chemical denervation, eliminating spasms and restoring fluent speech for 3 to 6 months.

Question 26Voice, laryngeal function, airway and sleep

Recurrent respiratory papillomatosis (RRP) is the most common benign laryngeal neoplasm in children and young adults. Which human papillomavirus (HPV) genotypes are responsible for greater than 90% of cases of RRP?

  1. HPV types 6 and 11 Correct answer.
  2. HPV types 16 and 18
  3. HPV types 31 and 33
  4. HPV types 1 and 2

Explanation

Recurrent respiratory papillomatosis is caused by human papillomavirus (HPV) infection, with low-risk subtypes HPV 6 and HPV 11 accounting for over 90-95% of cases. HPV 11 is generally associated with a more aggressive clinical course and higher recurrence rates.

Question 27Voice, laryngeal function, airway and sleep

During elective open surgical tracheostomy in an adult patient, the surgeon plans the incision into the anterior tracheal wall. Between which tracheal rings should the window or incision ideally be placed to prevent subglottic stenosis?

  1. Above the cricoid cartilage through the cricothyroid membrane
  2. Between the second and third (or third and fourth) tracheal rings Correct answer.
  3. Through the first tracheal ring and lower edge of the cricoid cartilage
  4. Between the sixth and seventh tracheal rings near the sternal notch

Explanation

Standard open surgical tracheostomy is placed through the second and third, or third and fourth, tracheal rings. Incising the first tracheal ring or the cricoid cartilage must be strictly avoided because proximity to the subglottis causes chondritis, granulation, and high rates of intractable subglottic stenosis.

Question 28Voice, laryngeal function, airway and sleep

On postoperative day 3 following an open tracheostomy, the tube is accidentally dislodged during patient repositioning. The bedside nurse attempts re-insertion, following which the patient becomes acutely breathless with absent chest rise, high ventilation resistance, and extensive subcutaneous emphysema over the neck and chest. What catastrophic event has occurred?

  1. Tension pneumothorax from an apical pleura puncture
  2. Acute rupture of the innominate artery into the anterior mediastinum
  3. Creation of a false lumen with placement of the tracheostomy tube into the pretracheal space Correct answer.
  4. Acute bilateral recurrent laryngeal nerve neuropraxia

Explanation

Before a mature epithelialized tract forms (typically 5 to 7 days postoperatively), blind re-insertion of a displaced tracheostomy tube carries high risk of creating a false lumen in the pretracheal soft tissues. Ventilating through a pretracheal false lumen causes progressive hypoxia, massive subcutaneous emphysema, and rapid cardiovascular collapse.

Question 29Voice, laryngeal function, airway and sleep

A patient with a tracheostomy tube in place for 10 days suddenly experiences a 50 mL gush of bright red arterial blood around the tube ('sentinel bleed'). What life-threatening complication must be immediately anticipated, and what is the crucial initial bedside temporizing maneuver?

  1. Carotid artery blowout; compress the common carotid against Chassaignac's tubercle
  2. Jugular vein laceration; pack the stoma with oxidized cellulose gauze
  3. Tracheoesophageal fistula; place a nasogastric tube to decompress the stomach
  4. Tracheo-innominate artery fistula; hyperinflate the tracheostomy cuff and perform digital compression (Utley maneuver) Correct answer.

Explanation

A sentinel bleed 7 to 14 days after tracheostomy heralds a tracheo-innominate artery fistula caused by pressure necrosis from a low stoma or overinflated cuff. Immediate life-saving management involves hyperinflating the tracheostomy cuff to tamponade the artery, and if bleeding continues, intubating from above, removing the tube, and inserting an index finger into the stoma to compress the innominate artery anteriorly against the posterior manubrium (Utley maneuver) en route to the OR.

Question 30Voice, laryngeal function, airway and sleep

A 50-year-old male presents with unilateral vocal fold immobility following an esophagectomy. Laryngeal electromyography (LEMG) is performed 4 weeks postoperatively. Which electrophysiological finding confirms active axonal denervation of the thyroarytenoid muscle?

  1. Abundant polyphasic motor unit potentials firing during voluntary phonation
  2. Fibrillation potentials and positive sharp waves detected at rest Correct answer.
  3. Complete electrical silence at rest with normal recruitment pattern
  4. Synchronous burst discharges during quiet respiration

Explanation

Laryngeal EMG performed between 2 and 6 weeks following nerve injury detects spontaneous fibrillation potentials and positive sharp waves at rest, which are classic electrophysiological hallmarks of active axonal degeneration and muscular denervation.

Question 31Voice, laryngeal function, airway and sleep

An anesthesiologist and otolaryngologist face a 'cannot intubate, cannot oxygenate' (CICO) crisis in a patient with acute supraglottic angioedema. What is the definitive anatomical entry site for emergency surgical cricothyrotomy?

  1. Thyrohyoid membrane between the hyoid bone and thyroid cartilage
  2. Tracheal wall between the third and fourth tracheal rings
  3. Cricothyroid membrane between the inferior thyroid cartilage and the cricoid cartilage Correct answer.
  4. Suprasternal notch above the clavicular heads

Explanation

The cricothyroid membrane lies immediately beneath the skin between the inferior border of the thyroid cartilage and the anterior arch of the cricoid cartilage. It provides the quickest, most superficial, and relatively avascular portal into the subglottic airway during an emergency CICO scenario.

Question 32Voice, laryngeal function, airway and sleep

Why is the posterior glottis (specifically the mucosa overlying the vocal process of the arytenoid cartilage) exceptionally vulnerable to ischemic ulceration and granuloma formation from prolonged endotracheal intubation?

  1. It has the thickest layer of loose subepithelial adipose tissue in the larynx
  2. The mucosa overlying the vocal process is extremely thin and tightly adherent to the underlying perichondrium with minimal submucosal cushion Correct answer.
  3. It receives a solitary, non-anastomotic end-artery from the internal carotid
  4. It is covered entirely by keratinized epidermis that lacks mucous glands

Explanation

The mucosa overlying the vocal process of the arytenoid cartilage is exceptionally thin, poorly vascularized, and tightly adhered directly to the underlying perichondrium. Pressure from an endotracheal tube exceeding mucosal capillary perfusion pressure (approx. 25-30 mmHg) causes rapid focal mucosal ischemia, ulceration, chondritis, and reactive pyogenic granuloma formation.

Question 33Voice, laryngeal function, airway and sleep

Under the named Myer-Cotton cross-sectional obstruction grading framework, which listed range corresponds to Grade III subglottic stenosis?

  1. Less than 50% luminal obstruction
  2. 51% to 70% luminal obstruction
  3. 71% to 99% luminal obstruction with identifiable lumen Correct answer.
  4. 100% complete obstruction with no detectable lumen

Explanation

The Myer-Cotton classification categorizes subglottic stenosis into four grades based on endotracheal tube sizing and percentage of lumen obstruction: Grade I is <=50% obstruction; Grade II is 51% to 70% obstruction; Grade III is 71% to 99% obstruction (detectable pinhole lumen present); and Grade IV is complete total obstruction (100%, no lumen).

Question 34Head and neck tumors, salivary and endocrine surgery

According to the standardized American Head and Neck Society (AHNS) and Robbins neck dissection classification, a surgeon performs a comprehensive neck dissection removing lymph node levels I through V while intentionally resecting the internal jugular vein (IJV) and sternocleidomastoid muscle (SCM), but strictly preserving the spinal accessory nerve (CN XI). What is the exact classification of this neck dissection?

  1. Radical Neck Dissection (RND)
  2. Modified Radical Neck Dissection Type III (Functional Neck Dissection)
  3. Modified Radical Neck Dissection Type II
  4. Modified Radical Neck Dissection Type I (MRND Type I) Correct answer.

Explanation

In comprehensive neck dissection (Levels I–V): Radical Neck Dissection (RND) resects all 3 non-lymphatic structures (CN XI, IJV, SCM). Modified Radical Neck Dissection (MRND) is subclassified based on which structures are preserved: MRND Type I preserves CN XI (resects IJV and SCM); MRND Type II preserves CN XI and IJV (resects SCM); and MRND Type III (functional neck dissection) preserves all three structures (CN XI, IJV, and SCM).

Question 35Head and neck tumors, salivary and endocrine surgery

An adult has an oral-tongue squamous carcinoma measuring 1.4 cm on the surface, depth of invasion 5.5 mm and a clinically and radiologically negative neck. Which listed neck-management strategy is supported by the supplied invasive-risk context?

  1. Elective neck dissection (selective neck dissection levels I–III / supraomohyoid) at the time of primary tumor resection Correct answer.
  2. Watchful waiting of the neck with observation and therapeutic neck dissection only upon palpable nodal recurrence
  3. Elective bilateral radical neck dissection (levels I–V) sacrificing both internal jugular veins
  4. Prophylactic high-dose external beam radiotherapy to the bilateral neck without surgery

Explanation

For oral cavity squamous cell carcinoma with Depth of Invasion (DOI) >3–4 mm, the risk of occult cervical nodal metastasis exceeds 20%. The landmark randomized prospective trial by D'Cruz et al. (NEJM 2015) demonstrated that elective neck dissection (selective neck dissection levels I–III / supraomohyoid) in cN0 oral cancer results in significantly superior overall survival (80% vs 67.5%) and disease-free survival compared to therapeutic dissection performed only upon nodal relapse.

Question 36Head and neck tumors, salivary and endocrine surgery

A 43-year-old woman presents with a painless, slow-growing, mobile, rubbery 2.5 cm lump in the right preauricular region and tail of the parotid gland. Facial nerve function is completely intact (House-Brackmann I). Fine-needle aspiration cytology (FNAC) shows mixed epithelial and myoepithelial cells embedded in a chondromyxoid stroma, consistent with a benign Pleomorphic Adenoma. What is the surgical procedure of choice for this superficial lobe lesion?

  1. Simple intra-capsular enucleation ('shelling out') of the tumor
  2. Superficial (lateral) parotidectomy with formal facial nerve dissection and preservation Correct answer.
  3. Total parotidectomy with sacrifice of the main facial nerve trunk and reconstruction with sural nerve graft
  4. Incisional open wedge biopsy under local anesthesia

Explanation

Superficial (lateral) parotidectomy with formal identification, dissection, and preservation of the facial nerve trunk and its branches is the gold-standard surgical approach for benign pleomorphic adenomas of the superficial parotid lobe. Simple enucleation ('shelling out') is strictly contraindicated because pleomorphic adenomas possess an incomplete, micro-infiltrative pseudocapsule and microscopic pseudopodia; enucleation leaves tumor rests in situ, leading to high recurrence rates (20–40%) and subsequent multifocal recurrence.

Question 37Head and neck tumors, salivary and endocrine surgery

A 52-year-old male presents with a firm mass in the hard palate and pain radiating along the maxillary division of the trigeminal nerve. Biopsy shows Adenoid Cystic Carcinoma (ACC) displaying a classic cribriform ('Swiss-cheese') architectural pattern with basaloid cells and cylinders containing basophilic myxoid material. What is the hallmark biological behavior of adenoid cystic carcinoma that dictates wide margins, tracking along nerve pathways, and long-term surveillance?

  1. Extremely high rate of early cervical lymphatic metastases requiring routine radical neck dissection
  2. Rapid cure within 2 years with low recurrence rates
  3. Propensity for extensive perineural invasion (skip lesions along nerves) and high rates of late distant metastases (lungs/bones) despite excellent initial local control Correct answer.
  4. Pure sensitivity to single-agent platinum-based chemotherapy

Explanation

Adenoid Cystic Carcinoma (ACC) is characterized by an indolent but relentlessly progressive clinical course, an extraordinary predilection for perineural invasion (with microscopic 'skip lesions' tracking long distances along cranial nerves toward the skull base), and high rates of late hematogenous distant metastases (most commonly to the lungs and bones, occurring 10–20 years after primary treatment). Cervical lymph node metastases are relatively uncommon, so elective neck dissection is rarely performed unless advanced T-stage or tubular subtype.

Question 38Head and neck tumors, salivary and endocrine surgery

A 58-year-old male with an advanced T4a squamous cell carcinoma of the anterior floor of mouth with bony mandibular invasion undergoes composite resection (commando procedure: composite resection of floor of mouth, segmental mandibulectomy of 7 cm of the mandibular arch, and bilateral neck dissection). What is the microvascular free tissue transfer flap of choice for reconstruction of this composite bony mandibular defect?

  1. Vascularized Fibula Osteocutaneous Free Flap Correct answer.
  2. Radial Forearm Fasciocutaneous Free Flap (without bone)
  3. Pectoralis Major Myocutaneous Flap alone
  4. Temporalis Muscle Rotation Flap

Explanation

The vascularized fibula free flap (based on the peroneal artery and venae comitantes) is the gold standard for mandibular reconstruction requiring segmental bony restoration >4–5 cm. It provides up to 25 cm of dense cortical bone, allows multiple closing wedge osteotomies to contour the mandibular arch, accommodates endosseous dental implants, and carries a reliable skin paddle for intraoral/extraoral mucosal reconstruction.

Question 39Head and neck tumors, salivary and endocrine surgery

A 62-year-old male with recurrent, unresectable squamous cell carcinoma of the oral cavity previously treated with primary surgery and adjuvant chemoradiotherapy develops locoregional progression and multiple pulmonary metastases. His Combined Positive Score (CPS) for Programmed Death-Ligand 1 (PD-L1) is 15 (CPS ≥1). According to the results of the phase III KEYNOTE-048 landmark trial, what is the first-line systemic therapy of choice?

  1. Methotrexate monotherapy orally weekly
  2. Pembrolizumab monotherapy (or pembrolizumab combined with platinum and 5-fluorouracil chemotherapy) Correct answer.
  3. Cetuximab monotherapy without chemotherapy
  4. High-dose systemic interleukin-2 (IL-2)

Explanation

Based on the landmark KEYNOTE-048 randomized clinical trial, the anti-PD-1 immune checkpoint inhibitor pembrolizumab monotherapy demonstrated statistically significant superior overall survival compared to the historic EXTREME regimen (cetuximab + platinum + 5-FU) in patients with recurrent or metastatic HNSCC whose tumors express PD-L1 with a Combined Positive Score (CPS) ≥1. For patients needing rapid tumor shrinkage, pembrolizumab plus platinum/5-FU is also an approved first-line standard.

Question 40Head and neck tumors, salivary and endocrine surgery

A 16-year-old girl presents with a painless 2 cm mass in the left parotid gland. Histopathological examination following superficial parotidectomy reveals a tri-cellular composition of mucin-secreting cells, intermediate (clear) cells, and epidermoid/squamous cells surrounding cystic and solid spaces. Molecular cytogenetic testing confirms the characteristic chromosomal translocation t(11;19)(q21;p13) generating the CRTC1-MAML2 fusion transcript. What is the diagnosis?

  1. Acinic cell carcinoma
  2. Warthin tumor (papillary cystadenoma lymphomatosum)
  3. Mucoepidermoid Carcinoma (MEC) Correct answer.
  4. Secretory carcinoma (MASC)

Explanation

Mucoepidermoid Carcinoma (MEC) is the most common malignant salivary gland neoplasm in both adults and pediatric populations. Histologically, it consists of a mixture of mucin-producing, intermediate, and squamous/epidermoid cells. The hallmark molecular genetic alteration in MEC is the t(11;19)(q21;p13) translocation, which creates the CRTC1-MAML2 (formerly MECT1-MAML2) fusion oncogene, associated with lower histological grade and favorable overall prognosis.

Question 41Head and neck tumors, salivary and endocrine surgery

A surgeon is performing a central compartment neck dissection (Level VI) for invasive papillary thyroid carcinoma. What anatomical boundaries define the boundaries of Level VI of the neck?

  1. Mandible superiorly, clavicle inferiorly, anterior belly of digastric laterally
  2. Skull base superiorly, clavicle inferiorly, posterior border of SCM laterally
  3. Hyoid bone superiorly, posterior belly of digastric inferiorly, midline medially
  4. Hyoid bone superiorly, suprasternal notch inferiorly, and medial borders of the common carotid artery sheaths laterally Correct answer.

Explanation

Level VI (the central compartment of the neck) is anatomically bounded superiorly by the lower border of the hyoid bone, inferiorly by the suprasternal notch (innominate artery), and laterally by the medial borders of the carotid sheaths (common carotid arteries) on both sides. It contains the pretracheal, paratracheal, and precricoid (Delphian) lymph nodes, surrounding the recurrent laryngeal nerves and parathyroid glands.

Question 42Head and neck tumors, salivary and endocrine surgery

A 42-year-old female undergoes fine-needle aspiration of a 2.4 cm solid thyroid nodule. The cytopathology report states: 'Bethesda Category IV: Follicular Neoplasm / Suspicious for a Follicular Neoplasm'. What is the critical histopathological distinction between a benign Follicular Thyroid Adenoma and a malignant Follicular Thyroid Carcinoma (FTC) that cannot be determined by cytology alone?

  1. Presence of psammoma bodies on smear
  2. Degree of nuclear enlargement and pleomorphism on aspiration
  3. Immunohistochemical staining for thyroglobulin
  4. Demonstration of full-thickness tumor capsular invasion and/or vascular invasion on histological permanent tissue sections Correct answer.

Explanation

Fine-needle aspiration cytology (FNAC) cannot differentiate follicular adenoma from follicular thyroid carcinoma because both share identical cellular morphology (monomorphic follicular cells arranged in microfollicles). The definitive histopathologic diagnosis of follicular thyroid carcinoma (FTC) strictly requires permanent histological sectioning demonstrating transcapsular invasion (tumor cells penetrating completely through the fibrous capsule) or angioinvasion (tumor cells invading blood vessel walls within or beyond the capsule).

Question 43Head and neck tumors, salivary and endocrine surgery

A 72-year-old female presents with a massive, rock-hard, rapidly expanding anterior neck mass that doubled in size over 3 weeks, accompanied by acute stridor, severe dysphagia, and left vocal cord fixation. Core needle biopsy confirms Anaplastic Thyroid Carcinoma (ATC). Molecular testing identifies a BRAF V600E mutation. What targeted combination systemic therapy has demonstrated significant overall survival benefit and rapid tumor regression in BRAF V600E-mutated anaplastic thyroid carcinoma?

  1. Dabrafenib (BRAF inhibitor) combined with Trametinib (MEK inhibitor) Correct answer.
  2. Imatinib (tyrosine kinase inhibitor targeting BCR-ABL)
  3. Trastuzumab combined with pertuzumab (HER2 inhibitors)
  4. Tamoxifen (selective estrogen receptor modulator)

Explanation

Anaplastic Thyroid Carcinoma (ATC) is one of the most lethal human malignancies. Approximately 40–50% of ATCs harbor the activating BRAF V600E mutation. The combination of dabrafenib (BRAF inhibitor) and trametinib (MEK inhibitor) was FDA/EMA-approved based on clinical trials demonstrating rapid, substantial tumor regression (overall response rate ~69%) and improved survival in BRAF V600E-mutated anaplastic thyroid cancer, often converting previously unresectable tumors into resectable candidates.

Question 44Head and neck tumors, salivary and endocrine surgery

A 58-year-old male is diagnosed with an exophytic T2 squamous cell carcinoma of the supraglottic larynx (involving the epiglottis and false vocal cords). Contrast CT of the neck shows no radiologically abnormal lymph nodes (cN0). Why is bilateral elective neck treatment (elective neck dissection or bilateral elective radiotherapy) routinely recommended for cN0 supraglottic carcinoma, whereas it is omitted in cN0 early glottic carcinoma?

  1. Supraglottic carcinoma has no lymphatic drainage, causing direct bloodstream dissemination
  2. The supraglottic larynx arises from the buccopharyngeal anlage and has a rich, bilateral lymphatic capillary network draining across the thyrohyoid membrane to levels II–IV, carrying a 30–40% occult nodal metastasis risk Correct answer.
  3. Supraglottic carcinoma is caused by HPV-16, which requires neck dissection for staging
  4. Early glottic carcinoma invariably spreads to Level I submandibular nodes

Explanation

Embryologically and anatomically, the supraglottis arises from the buccopharyngeal anlage and possesses an extensive, rich, bilateral lymphatic drainage network that exits through the thyrohyoid membrane into levels II, III, and IV. Consequently, even early cN0 supraglottic cancers have a 30–40% risk of occult cervical nodal metastases, mandating bilateral elective neck treatment. In contrast, the true vocal cords (glottis) arise from the tracheobronchial anlage and have virtually no lymphatic capillaries in Reinke's space, giving early glottic cancer <1–2% occult nodal risk.

Question 45Head and neck tumors, salivary and endocrine surgery

Before planned harvest of a radial forearm flap for a head-and-neck defect, which listed clinical test assesses collateral hand perfusion, while not independently guaranteeing the safety of harvest?

  1. Tinel's sign over the carpal tunnel
  2. Phalen's maneuver of the wrist
  3. Modified Allen's test (assessing collateral perfusion of the palmar arch within 5–10 seconds) Correct answer.
  4. Finkelstein's test of the thumb tendons

Explanation

The modified Allen test assesses the clinical contribution of collateral circulation to the hand. Interpretation and any additional vascular assessment depend on the actual patient and reconstructive plan. A reassuring bedside test is not by itself a guarantee that radial-artery harvest is safe in every case.

Question 46Head and neck tumors, salivary and endocrine surgery

A 48-year-old male who underwent a right superficial parotidectomy 14 months ago presents with sweating, flushing, and warmth over his right preauricular and temporal skin that occurs exclusively while eating meals, especially sour or spicy foods. What is the diagnosis, and what is the underlying neurophysiological mechanism?

  1. Frey's syndrome (Gustatory Sweating / Auriculotemporal syndrome); aberrant misdirected regeneration of parasympathetic secretomotor fibers of the auriculotemporal nerve (CN IX from otic ganglion) into sympathetic cholinergic receptors supplying cutaneous sweat glands and subcutaneous vessels Correct answer.
  2. First Bite syndrome; sympathetic hyperinnervation of the parotid myoepithelial cells
  3. Recurrent pleomorphic adenoma; mechanical pressure on the facial nerve
  4. Horner's syndrome; loss of sympathetic innervation to the pupillary dilator

Explanation

Frey's syndrome (auriculotemporal syndrome / gustatory sweating) occurs in up to 30–50% of post-parotidectomy patients. It results from transected postganglionic parasympathetic secretomotor fibers (traveling from the glossopharyngeal nerve / otic ganglion via the auriculotemporal nerve to the parotid gland) regenerating aberrantly along pathways of transected sympathetic fibers to innervate overlying subdermal sweat glands and cutaneous blood vessels. Mastication triggers sweating and erythema. It is confirmed by the Minor starch-iodine test and treated effectively with intradermal botulinum toxin A injections.

Question 47Head and neck tumors, salivary and endocrine surgery

A 64-year-old farmer presents with a T2 squamous cell carcinoma of the central lower lip. Wide local oncologic excision with 5 mm clear margins results in a full-thickness defect involving 60% of the lower lip length without commissure involvement. What local-regional reconstructive flap preserves the neurovascular supply (labial arteries and branches of the facial and mental nerves) maintaining dynamic oral competence and sphincter function?

  1. Abbe flap from the central upper lip (requires division of the pedicle at 3 weeks)
  2. Karapandzic circumoral rotation-advancement flap Correct answer.
  3. Bernard-Fries cheek advancement flap
  4. Pectoralis major regional myocutaneous flap

Explanation

The Karapandzic flap is a circumoral rotation-advancement flap designed specifically for large full-thickness lower lip defects (50–75% of lip width). Its unique advantage is meticulous preservation of the superior and inferior labial neurovascular bundles and facial nerve motor branches supplying the orbicularis oris muscle, resulting in a dynamic, functional, innervated, and competent oral sphincter (though microstomia can occur and may require secondary commissuroplasty).

Question 48Pediatric airway, infection, congenital disease and development

A 7-year-old boy presents with a painless 2 cm midline anterior neck mass located just inferior to the hyoid bone. On physical examination, the cystic mass moves superiorly when the child swallows and when he protrudes his tongue. Ultrasound confirms a cystic lesion containing internal debris closely associated with the body of the hyoid bone. What is the diagnosis, and what is the standard curative surgical operation required to prevent recurrence?

  1. Dermoid cyst; simple subcutaneous enucleation sparing the hyoid bone
  2. Thyroglossal Duct Cyst (TGDC); Sistrunk procedure (en-bloc excision of the cyst, the central body of the hyoid bone, and a core of tongue base muscle tissue tracking to the foramen cecum) Correct answer.
  3. Plunging ranula; transoral sublingual gland excision
  4. Ectopic thyroid gland; complete thyroidectomy

Explanation

A thyroglossal duct cyst (TGDC) arises from persistent remnants of the thyroglossal tract formed during thyroid embryological descent from the foramen cecum at the tongue base to the inferior neck. Because the tract passes directly through or intimately anterior to the hyoid bone, simple cyst excision results in an unacceptably high recurrence rate (~50%). The Sistrunk procedure (en-bloc resection of the cyst, the central 1–1.5 cm of the hyoid bone body, and a muscular core of tissue extending to the foramen cecum) is the curative standard, reducing recurrence to <2–4%.

Question 49Pediatric airway, infection, congenital disease and development

A 6-year-old boy is brought to the emergency department on postoperative day 7 following an uncomplicated adenotonsillectomy with active brisk secondary bleeding from the oral cavity. On examination, he is pale, heart rate is 145 bpm, blood pressure is 90/55 mmHg, and continuous bright red blood and clots are filling the oropharynx from the right tonsillar fossa. What is the immediate, prioritized management algorithm?

  1. Discharge home on oral tranexamic acid and oral iron supplements
  2. Apply silver nitrate chemical cautery in the ED waiting room without IV access
  3. Immediate vascular resuscitation (large-bore IV access, crystalloid bolus, type and crossmatch), airway stabilization with NPO status, and emergency transfer to the operating room for endotracheal intubation and surgical hemostasis under general anesthesia Correct answer.
  4. Perform immediate bedside tracheostomy

Explanation

Secondary post-tonsillectomy hemorrhage (most common on postoperative days 5–10 when the fibrin eschar sloughs) with active brisk bleeding and hemodynamic compromise in a pediatric patient is a life-threatening emergency. Immediate priorities are: 1) Large-bore IV access, immediate fluid resuscitation, and blood typing/crossmatch, 2) Protecting the airway from aspiration of swallowed blood, keeping the child NPO, and 3) Emergency transfer directly to the operating room for rapid-sequence induction, intubation (with high-volume suction ready for gastric decompression), and definitive surgical control (electrocautery, suture ligation, or pillar suturing).

Question 50Pediatric airway, infection, congenital disease and development

A 3-year-old child presents with high fever, neck stiffness, and posterior pharyngeal bulging following an acute upper respiratory infection. Contrast CT reveals suppurative adenitis in the nodes of Rouvière. In which deep neck space are these nodes located?

  1. Prevertebral space
  2. Retropharyngeal space Correct answer.
  3. Visceral space
  4. Submandibular space

Explanation

The nodes of Rouvière are the lateral retropharyngeal lymph nodes located in the retropharyngeal space medial to the internal carotid artery. They drain the nasopharynx, adenoids, and posterior paranasal sinuses and commonly atrophy after age 5, explaining why retropharyngeal abscesses are most frequent in early childhood.