Vertigo, tinnitus with prolonged nystagmus on exam. The bilateral 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 left mastoid air cells and middle ears also appear unremarkable. There is minimal scattered right mastoid mucosal thickening and enhancement. There is cystic cavum septum pellucidum that measures 20 mm in width.
1. No evidence of retrocochlear or inner ear lesions.2. Incidental cystic cavum septum pellucidum that measures 20 mm in width.