The vestibular aqueduct is not enlarged. LEFT: The internal auditory canal and cochlear aperture are both mildly asymmetrically smaller in comparison to the right side. The left cochlear nerve is not discretely visualized at the expected position within the internal auditory canal. The facial nerve and superior/inferior vestibular nerves appear normal in position. The inner ear structures, including the semicircular canals, vestibule, and cochlea are unremarkable.