Episodic dizziness, recent right ear infection and hearing loss, for which the differential diagnosis includes vestibular neuritis or labyrinthitis versus BPPV, although Dix-Hallpike was negative. Internal Auditory Canals: The bilateral cranial nerve 7 and 8 complexes are intact. There is no evidence of mass lesions or abnormal enhancement in the region of the internal auditory canals. The inner ear structures, including the cochlea, vestibule, endolymphatic duct, and semicircular canals, appear unremarkable. The bilateral mastoid air cells and middle ears also appear unremarkable.Brain MRA: There is no evidence of significant steno-occlusive lesions or saccular aneurysms.Neck MRA: There is mild to moderate stenosis of the proximal right internal carotid artery and perhaps mild stenosis of the proximal left internal carotid artery. The vertebral arteries appear to be intact.
1. No evidence of retrocochlear lesions.2. Mld to moderate stenosis of the proximal right internal carotid artery and perhaps mild stenosis of the proximal left internal carotid artery, but no evidence of intracranial steno-occlusive lesions.