Arachnoid cyst in the internal auditory canal.
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.
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