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Five progressive clues
These are the case findings in their original reveal order, moving from the broader presentation to the most discriminating evidence.
Clue 1
A 52-year-old high-school music teacher books an audiology appointment because for several months he has struggled to understand callers when he holds the phone to his right ear — he now automatically switches it to the left without thinking. He also mentions a faint, constant ringing on the right that he first blamed on his noisy commute.
Clue 2
The hearing difficulty came on gradually over about eight months and affects only the right ear; the ringing is high-pitched and unremitting. He denies any true room-spinning attacks, ear fullness, or day-to-day fluctuation in his hearing, though he notes a little unsteadiness when he turns quickly in a dark hallway. He has no history of loud-noise hobbies, ear surgery, or ototoxic medication.
Clue 3
Otoscopy is normal and tympanometry is type A bilaterally. Pure-tone testing shows only a mild-to-moderate high-frequency loss in the right ear — yet his word-recognition score in that ear is far poorer than those thresholds would predict, and when the presentation level is raised further the score paradoxically drops rather than improves.
Clue 4
Acoustic reflexes on the right show abnormal decay, and auditory brainstem response testing seals it: the left trace is normal, but on the right wave V is delayed with an interaural wave V latency difference of 0.4 ms and a prolonged I–V interpeak interval — findings that place the problem beyond the cochlea, along the eighth nerve.
Diagnosis
Acoustic Neuroma
Why the diagnosis fits
The picture is progressive, strictly unilateral high-frequency sensorineural loss with one-sided tinnitus and mild positional unsteadiness, and — critically — retrocochlear signs: word-recognition scores far worse than the modest pure-tone thresholds predict, with rollover (scores dropping as intensity rises), plus a prolonged interaural wave V latency and I–V interpeak interval on ABR. That triad of disproportionate word recognition, abnormal ABR, and an enhancing mass centered on and widening the internal auditory canal localizes the lesion to the eighth-nerve/IAC, not the cochlea. The KEY DISCRIMINATOR from Ménière's disease is the pattern of hearing loss and vestibular history: there is no episodic spinning vertigo, no aural fullness, and no fluctuating low-frequency loss — instead a steady, progressive high-frequency loss with retrocochlear electrophysiology, which Ménière's (a cochlear/endolymphatic disorder) does not produce. The IAC-centered, funnel-shaped mass without a dural tail further separates it from a cerebellopontine-angle meningioma.
Educational reference
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