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Epidermoid (cholesteatoma) is a rare mass of the cerebello-pontine angle (CPA). We here with present a case of CPA epidermoid that caused sudden sensorineural hearing loss (SSNHL). A 39-year old woman was presented with the complaints of right hearing loss, tinnitus and dizziness. She had been followed up for CPA epidermoid until the development of hearing loss. Her audiological tests revealed profound sensorineural hearing loss in the right ear, without vestibular findings. Magnetic resonance imaging (MRI) showed a mass of 14x14 mm with irregular borders that filled the right CPA and invaded 7-8th cranial nerves. The mass was interpreted as “epidermoid”. Her hearing returned to normal with oral steroid treatment by the 8th day of the treatment. This patient was the second one with SSNHL associated with CPA epidermoid in literature, and the first one successfully treated with steroids. Through this case, we also reviewed CPA masses, and specifically epidermoids with accompanying SSNHL.

Epidermoid of the Cerebellopontine Angle that Caused Sudden Hearing Loss: Report of a Medically Treated Case