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[Auditory brain stem responses in the diagnosis of acoustic neurinoma (author's transl)].

Auditory brain stem responses (ABR, BSR) were obtained in 16 patients with acoustic neurinoma. The pattern of ABR was studied with reference to the tumor size and the pure tone audiogram in each case.As a result, the 16 cases were classified into 4 types. In 2 patients, wave I, III and V were clearly recorded but wave III and V were prolonged in latency (type I). In 4, wave I and V were recorded but all other components of ABR were markedly obscured and wave V was more prolonged in latency than in type I (type II). In 5, only wave I was recognized (type III). No ABR response was obtained in remaining 5(type IV).The diameters of the tumors were as follows; 0.8cm and 2cm in type I, 2.5cm to 3.5cm (mean: 3cm) in type II, 3cm to 5cm (mean: 3.8cm) in type III, and 4cm to 6cm (mean: 4.8cm) in type IV.From these results, it was considered that the pattern of ABR reflects the size of the tumor to some extent. However, no definite tendency was found concerning the relationship between the pure tone audiogram and the ABR pattern.