Sudden right idiopathic hearing loss. The bilateral cranial nerve 7 and 8 complexes are intact. There is no evidence of mass lesions. The right inner ear structures, including the cochlea, vestibule, endolymphatic duct, and semicircular canals, appear unremarkable. There is suggestion of dehiscence of the posterior portions of the left superior and posterior semicircular canals. The bilateral mastoid air cells and middle ears also appear unremarkable. There are left maxillary sinus retention cysts. The bilateral are diffusely prominent bilaterally.
1. No evidence of right retrocochlear or inner ear lesions.2. Suggestion of dehiscence of the posterior portions of the left superior and posterior semicircular canals. A temporal bone CT may be useful for further delineation.3. The bilateral are diffusely prominent bilaterally, which may be a normal variant or represent sialosis.