[Clinical significance of the changes in interpeak latency of brainstem auditory evoked potentials in patients with cerebellopontine angle tumors].

Brainstem auditory evoked potentials (BAEP) were recorded and studied in 21 cases of cerebellopontine angle tumors (CPATs) identified with CT/operations. 111 healthy volunteers with 207 normal hearing ears served as controls. In the main the results indicated that there was an average significant increase of the III-V IPL in comparison with the III-V/I-III IPL on contralateral side. This finding suggested that as a result of its displacement of the brainstem to the opposite side, stem from the contralateral bony structure, when CPAT was suspected. Since individual variations exist especially in aged persons, interpretation in clinical practice had still to be individualized.