Narrow internal auditory canal syndrome: parasaggital reconstruction

Narrow internal auditory canal (IAC) syndrome is a malformation of the temp oral bone, that is defined as an IAC diameter of only 1-2 mm on high-resolu tion computed tomographic scans (HRCT). This syndrome is known to be caused by the absence (aplasia or hypoplasia) of the vestibulocochlear nerve. We present a case of unilateral narrow IAC syndrome which was diagnosed by HRC T. The aplasia of the vestibulocochlear nerve was confirmed using parasigit tal reconstruction magnetic resonance image (MRI). The IAC was composed of two separate canals, one of which contained a facial nerve and the other wa s empty with aplasia of the vestibulocochlear nerve.