No definite abnormality is seen in the visualized portion of the brain parenchyma. The paranasal sinuses are clear. IMPRESSION: Developmental anomaly of the right inner ear structures with cystic dilatation 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. Suggestion of absent right cochlear nerve.