Left ear tinnitus and sensorineural hearing loss. . There is apparent deficiency of bone overlying the left superior semicircular canal. The rest of the inner ear structures otherwise appear unremarkable. The bilateral cranial nerve 7 and 8 complexes are intact. There is no evidence of mass lesions. The bilateral mastoid air cells and middle ears also appear unremarkable. A subcentimeter focus of high T1 signal along the midline of the anterior cranial fossa may represent prominent fatty marrow within the crista galli rather than a meningioma, although this is incompletely characterized.
1. Apparent left superior semicircular canal dehiscence, which can be confirmed via a temporal bone CT, if clinically warrented. Otherwise, no evidence of vestibular schwannoma.2. A subcentimeter focus of high T1 signal along the midline of the anterior cranial fossa may represent prominent fatty marrow within the crista galli rather than a meningioma, although this is incompletely characterized.