Three Cases of Cerebello-Pontine Angle Tumor with Normal ABR and No Canal Paresis
1993 Volume 1993 Issue Supplement68 Pages 76-80
Details
1993 Volume 1993 Issue Supplement68 Pages 76-80
Auditory brainstem response (ABR) and caloric test are very useful in diagnosing cerebello-pontine angle tumors (CPAT) because of their high sensitivity. As improvements of CT and MRI make the detection of smaller tumors possible, we encountered a few CPAT cases that have normal ABR and no canal paresis (CP). Three cases of CPAT with normal ABR and no CP are reported. In our series,4 of 44 tumors tested had normal ABR and 4of 42 tumors had no CP. The false-negative rates were 9% and 10%, respectively. Since both tests indicated a high positive rate, they are still used as a screening test for diagnosis of CPAT.
