Unilateral dilatation of the internal auditory canal.
An unusual and functionally insignificant variant of the internal auditory canal is presented. Marked dilatation of one canal was demonstrated by petrous bone tomography. Pantopaque cisternography revealed a large intracanalicular extension of the subarachnoid space with no evidence of tumor. No patients should undergo exploration of this region without prior Pantopaque studies.
D006801:Humans; D008297:Male; D008875:Middle Aged; D010579:Petrous Bone / Q000002:abnormalities* / Q000000981:diagnostic imaging; D011859:Radiography