48 year-old male with history of profound right and mild left sensorineural hearing loss. Evaluate for possible LEFT cochlear hydrops. The bilateral cranial nerve 7 and 8 complexes are intact. There is no evidence of mass lesions. There appears to be thinning of the bone overlying the right superior semicircular canal, which is otherwise inconspicuous in some parts. The bilateral endolymphatic ducts are not discernible. The other inner ear structures otherwise appear unremarkable. There is fluid within the bilateral mastoid air cells. There is no evidence of intracranial hemorrhage, mass, or acute infarct. The brain parenchyma and pituitary gland appear unremarkable. There is no abnormal intracranial enhancement. The ventricles and basal cisterns are normal in size and configuration. There is no midline shift or herniation. The major cerebral flow voids are intact. The orbits, skull, paranasal sinuses, and scalp soft tissues are grossly unremarkable.
1. The bilateral endolymphatic ducts are not discernible. This can be due to technical factors or may be a manifestation of Meniere disease. A dedicated temporal bone CT may be useful for further evaluation.2. Possible dehiscence and dyplasia of the right superior semicircular canal. A dedicated temporal bone CT may also be useful for further evaluation.3. The bilateral cochleas and cochlear nerves are intact. 4. Probable bilateral mastoid air cell effusions.