Abstract
A case of unilateral dilatation of the internal auditory canal without acoustic tumor is presented. The patient was found to have a bilateral C5 dip and canal paresis in the left ear.
Marked dilatation of one canal was demonstrated on temporal bone tomography. The left canal was 2mm higher than the right. The left posterior wall was 3mm shorter than the right. Pantopaque cisternography revealed a large intracanalicular extension of the subarachnoid space with no evidence of tumor.
