頸静脈孔神経鞘腫の一例:神経耳科学的考察

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A 65-year-old women was admitted to our hospital with complaints of dizziness, hearing loss and tinnitus. The hearing test revealed left sensorineural hearing loss. Furthermore, the patient exhibited Bruns-Cushing n y stagmus, canal paresis and directional preponderance of nystagmus caloric response in the left ear, strong inhibitory nystagmus on the optokinetic test, saccadic eye movement on the eye tracking test, but no cranial symptoms, except for impaired balance and nystagmus. These finding indicated the presence of a cerebellopontine angle tumor. Stenverse view and temporal polytomogram showed enla r gement of the left jugular foramen without enlargement of the left internal auditory canal. Computed Tomography and vertebral angiogram demons t rated a space occupying lesion at the left cerebellopontine angle. Retromastoid craniectomy confirmed a large tumor that covered the left jugular foramen and foramen magunum. The tumor was encapsuled with a thin smooth capsule. The histological diagnosis was neurinoma. We suspected that this tumor arose from the XIth cranial nerve.
耳鼻咽喉科臨床学会の論文