Left sided asymmetric sensorineural hearing loss. There appears to be deficient bone overlying the superior semicircular canal. Otherwise, the inner ear structures, including the cochlea, vestibule, endolymphatic duct appear unremarkable. There is a somewhat prominent venous flow void in the cerebellopontine angle cistern, but the cranial nerve 7 and 8 complexes are intact. There is no evidence of mass lesions. The mastoid air cells and middle ears also appear unremarkable.Right: The cranial nerve 7 and 8 complexes are intact. There is no evidence of mass lesions. The inner ear structures, including the cochlea, vestibule, endolymphatic duct, and semicircular canals, appear unremarkable. The mastoid air cells and middle ears also appear unremarkable.
Apparent deficient bone overlying the superior semicircular canal, which may represent dehiscence, but no evidence of retrocochlear or inner ear lesions. A temporal bone CT may be useful for further evaluation.