Abstract
We retrospectively investigated 80 cases of cerebellopontine angle space-occupying lesion (CP angle SOL) including acoustic neuroma. This study demonstrated that approximately 20% of the CP angle SOL cases complaining chiefly of unilateral acoustic sympton (56 cases) or vertigo (17 cases) showed false negative finding on otoneurological examinations and plain X-ray picture of internal acoustic canal. Considering that cerebrovascular disorder is also an important etiology of vertigo, early MRI study is recommended in order to rule-out central pathologies on the cases with unilateral acoustic sympton or vertigo showing difficulty to be clearly diagnosed or delay to improve.
