title: Arachnoid cyst in the internal auditory canal.
abstract: An arachnoid cyst of the internal auditory canal causing compression atrophy of nerve trunks was found in each of three human temporal bones. Arachnoid cysts are found in about 0.5% of operations for suspected neoplasm of the internal auditory canal. There is no current method for differentiating intracanalicular neoplasm from arachnoid cysts.
mesh_terms: D000368:Aged; D001099:Arachnoid; D001299:Audiometry; D001932:Brain Neoplasms / Q000175:diagnosis; D003560:Cysts / Q000175:diagnosis / Q000473:pathology*; D003937:Diagnosis, Differential; D004424:Ear Canal; D004427:Ear Diseases / Q000175:diagnosis / Q000473:pathology*; D005260:Female; D006312:Hearing Loss, Bilateral / Q000209:etiology; D006801:Humans; D008297:Male; D009408:Nerve Compression Syndromes / Q000209:etiology; D013701:Temporal Bone; D014725:Vestibular Nerve