There is dilated cystic appearance of the vestibule, cochlea and the proximal portion of the superior and posterior semicircular canals. There is heterogeneity within the cyst, which may represent proteinaceous content or prominent dilated membranous labyrinth. There is dysmorphic configuration of the lateral semicircular canal. The vestibular aqueduct is not enlarged. On the left side, the external auditory canal is patent.