ABOHNS Neurotology common mistakes
ABOHNS Neurotology · Understand the traps and how to avoid them.
Committing to a single diagnosis (e.g., Meniere's disease) as soon as episodic vertigo is mentioned, without first classifying the timing pattern (episodic vs continuous) and trigger (positional vs spontaneous).
Candidates pattern-match the buzzword 'episodic vertigo' to the most familiar disease entity and stop reasoning, skipping the branch points that separate vestibular migraine, Meniere's, BPPV, and vestibular paroxysmia.
What to do instead
Before naming a diagnosis, explicitly state the timing (episodic/continuous), the trigger (positional, head movement, spontaneous, sound/pressure), and the duration of attacks; use these three axes to drive the differential, then apply test findings.
Interpreting a horizontal head impulse test as 'normal' without checking for covert (overt vs covert) saccades, or calling a positive vHIT 'central' purely because the gain is reduced.
Candidates conflate bedside HIT with vHIT and do not know that catch-up saccades can be covert, and they over-attribute reduced gain to central pathology rather than a peripheral vestibular deficit.
What to do instead
State that a peripheral lesion produces reduced gain with corrective saccades (covert or overt), while central patterns include normal gain with saccades or pure vertical/pitch abnormalities; describe what each finding localizes.
Treating a canalith-repositioning sequence as the answer for any positional vertigo, including cases with atypical nystagmus direction, latency, or fatigability that suggest a central cause.
BPPV is over-learned as a reflex answer, and candidates skip the nystagmus-characterization step (direction, latency, duration, fatigability, suppression) that distinguishes peripheral from central positional vertigo.
What to do instead
Describe the nystagmus first (direction-changing vs fixed, latency, duration, fatigability, suppression with fixation) and justify the maneuver choice from those features before committing to repositioning.
Describing the facial nerve course using only 'tympanic and mastoid segments' and omitting the labyrinthine segment and geniculate ganglion when localizing a lesion or planning decompression.
Candidates memorize the vertical/horizontal segment dichotomy and forget that the labyrinthine segment and meatal foramen are the narrowest, highest-risk portion and the key surgical target in decompression.
What to do instead
Recount the full course in order (meatal, labyrinthine, geniculate, tympanic, mastoid) and tie each segment to the clinical syndrome and to the surgical approach before answering.
Choosing a facial nerve grading scale or electrodiagnostic test without stating the timing window in which it is valid (e.g., interpreting ENoG within the first 72 hours).
Candidates recall test names but not the temporal validity of ENoG/EMG or the difference between prognostic and rehabilitative intent, so they apply a test at a time it cannot inform management.
What to do instead
For each electrodiagnostic test, state the earliest time it becomes meaningful, what it predicts, and how the result changes management; if timing is not given, say what timing you would require.
Planning a translabyrinthine, retrosigmoid, or middle fossa approach without first stating the tumor size, hearing status, and facial nerve status that justify it.
Candidates memorize approach-to-tumor pairings and skip the selection criteria (hearing preservation candidacy, tumor size, serviceability of hearing, patient goals) that actually determine the approach.
What to do instead
Before naming an approach, list the decision variables (size, hearing class, facial function, patient priorities) and then justify the approach by showing which variables it satisfies and which it sacrifices.
Conflating conductive and sensorineural patterns on audiometry by reading thresholds alone and ignoring air-bone gap, interaural differences, and word-recognition scores.
Candidates focus on the pure-tone average as a single number and treat the audiogram as a hearing-level label rather than a pattern, missing the gap and speech scores that change the diagnosis and rehab plan.
What to do instead
Read every audiogram in a fixed order (PTA, air-bone gap, interaural asymmetry, word recognition, tympanometry) and state which pattern is present before interpreting its cause.
Recommending a cochlear implant or bone-conduction device without first stating candidacy criteria (degree and configuration of loss, word recognition, anatomy, and expected benefit) for that specific device.
Candidates jump to the most familiar device and do not compare devices against the patient's audiometric profile, so they recommend an implant for a conductive loss or a bone device for a cochlear loss.
What to do instead
Match device class to loss type first (sensorineural vs conductive/mixed), then apply candidacy thresholds and word-recognition criteria before naming a device.
Managing sudden sensorineural hearing loss with a delayed or partial workup, omitting the urgency statement and the timing of treatment initiation.
Candidates treat SSNHL as routine hearing loss and do not anchor on the time-critical nature of presentation-to-treatment interval, missing the point that outcome depends on prompt steroids and appropriate imaging.
What to do instead
State SSNHL as an otologic emergency, give the treatment window and first-line therapy, and specify which patients need MRI or further workup for retrocochlear causes.
Describing a vestibular schwannoma or skull base lesion workup without specifying which imaging sequence and which findings change management (e.g., internal auditory canal protocol, cystic change, brainstem compression).
Candidates name 'MRI' generically and do not distinguish the fine-cut IAC protocol from routine brain imaging, nor do they connect specific imaging features to observation versus surgery versus radiation.
What to do instead
Name the specific imaging study and protocol, then state which imaging features (size, cystic component, brainstem contact, contralateral hearing) drive the management recommendation.