Left hyperacusis: parkinsonism. The bilateral cranial nerve 7 and 8 complexes are intact. There is no evidence of mass lesions. There may be deficiency of bone overlying the left superior semicircular canal. The other inner ear structures otherwise appear unremarkable bilaterally. The bilateral mastoid air cells and middle ears also appear unremarkable. There is what appears to be cerumen in the left external auditory canal.
Possible left superior semicircular canal dehiscence. A temporal bone CT may be useful for further evaluation.