A 9-Month-Old With a Draining Ear and an Uncooperative Examination
A 9-month-old boy is brought to the clinic with right ear discharge for 6 weeks. He was treated with two courses of oral amoxicillin-clavulanate and topical ciprofloxacin by his pediatrician. The mother reports low-grade fever and irritability but no neck stiffness or vomiting. On examination, the child is alert but crying and resistant. The pinna is not displaced. The external canal is full of thick, foul-smelling purulent material, obscuring the tympanic membrane. The left ear is clear. The child has no known immunodeficiency, no craniofacial anomaly, and immunization is up to date. The mother is anxious and asks why the ear is not healing. The nearest CT scanner is 3 hours away.
1. What is your differential diagnosis, and what is the most important diagnosis to exclude?
Read the worked answer
The differential includes: (1) acute otitis media with spontaneous perforation and secondary bacterial infection; (2) chronic suppurative otitis media; (3) otitis externa, including malignant (necrotizing) otitis externa, though this is rare in an immunocompetent infant; (4) retained foreign body or cotton wool; (5) mastoiditis with subperiosteal abscess; (6) tuberculosis otitis media, especially with chronic foul discharge and non-response to standard antibiotics.
The most important diagnosis to exclude is acute mastoiditis with or without subperiosteal abscess, because it can progress to intracranial complications (meningitis, sigmoid sinus thrombosis, brain abscess). In an infant, the mastoid antrum is well developed, and the mastoid cortex is thin, so infection can spread early. Clinical signs to look for: postauricular swelling, erythema, tenderness, pinna displacement, fever, and systemic toxicity. This child has no pinna displacement, but crying and resistance make the postauricular area difficult to assess. A low threshold for further imaging is warranted if there is any doubt.
2. How would you manage this child in the clinic, given the limited access to CT?
Read the worked answer
Secure the airway and optimize the child for examination. Have a nurse hold the child. Use an otoscope with a speculum. If the canal remains obscured, gently suction or dry-mop the canal under direct vision. Do not syringe forcefully in a potentially perforated ear.
Clean the canal. Remove debris with a fine suction tip or dry cotton wool on a Jobson Horne probe. This is both diagnostic and therapeutic. Once the canal is clear, inspect the tympanic membrane for perforation, granulation tissue, or a foreign body.
Assess for mastoiditis. Palpate the postauricular area gently and compare sides. Look for fluctuance, erythema, and pinna displacement. Check for facial nerve weakness and neck stiffness.
Take a swab for culture before changing antibiotics.
Escalate antibiotics. If there is no improvement after 2 courses, consider resistant organisms (e.g., Pseudomonas, MRSA, or anaerobes). A topical fluoroquinolone with adequate aural toilet is appropriate for otorrhea; systemic antibiotics should be guided by culture and clinical findings. Avoid aminoglycoside drops if perforation is suspected.
Arrange imaging if mastoiditis or complications are suspected. Given the 3-hour CT distance, discuss with a pediatrician and consider transfer if there is postauricular swelling, persistent fever, or toxicity. MRI is preferred for intracranial complications but is even less available.
Follow-up within 48–72 hours. If no improvement, refer to ENT for examination under anesthesia and possible imaging.
3. What would make you suspect tuberculosis, and how would that change your management?
Read the worked answer
Suspect tuberculosis if there is:
- Chronic, painless, foul-smelling otorrhea that fails to respond to multiple courses of standard antibiotics.
- Multiple small perforations of the tympanic membrane or a large, pale, granular perforation.
- Preauricular lymphadenopathy or a preauricular sinus.
- A history of contact with tuberculosis or a positive Mantoux test.
- Systemic symptoms such as weight loss, night sweats, or chronic cough.
If suspected:
- Take a swab for acid-fast bacilli (AFB) smear, culture, and PCR.
- Perform a chest X-ray and consider gastric aspirate in children.
- Refer to a pediatric infectious disease specialist.
- Start standard anti-tuberculous therapy (isoniazid, rifampicin, pyrazinamide, ethambutol) after confirmation or strong clinical suspicion.
- ENT follow-up for possible mastoidectomy if there is persistent disease or complications.