DO-HNS (RCSI) Practice Questions - Diploma In Otolaryngology - Head And Neck Surgery (DO-HNS) (RCSI, Ireland) Exam

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A 45-year-old man presents with recurrent episodes of rotational vertigo lasting between 1 and 3 hours, accompanied by a roaring sound in his left ear and a sensation of pressure. Audiometric testing during an symptomatic phase demonstrates a low-to-medium-frequency sensorineural hearing loss in the left ear. What is the primary pathophysiological mechanism underlying this disease?

Ectopic bone formation around the stapes footplate Endolymphatic hydrops leading to distension of the membranous labyrinth Migration of calcium carbonate crystals into the posterior semicircular canal Microvascular compression of the vestibulocochlear nerve in the cerebellopontine angle

Correct Answer:

Endolymphatic hydrops leading to distension of the membranous labyrinth

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