A case report of narrow internal auditory canal: Parasagittal reconstruction / 대한이비인후과학회지

ABSTRACT

A narrow internal auditory canal(IAC) is a malformation of the temporal bone, which is defined as IAC diameter of only 1-2mm in high resolution computed tomography(HRCT). This syndrome is known to be caused by aplasia or hypoplasia of the vestibulocochlear nerve. We present a case of unilateral narrow IAC which was diagnosed by HRCT. The aplasia of vestibulocochlear nerve was confirmed using MRI with parasagittal reconstruction images. The IAC was composed of two separate canals, one of which had facial nerve and the other an empty space by aplasia of the vestibulocochlear nerve.