[Tumor-induced function disorders of the acoustic nerve and the lower portions of the auditory pathway].

The manyfold features of acoustic neuromas, respectively tumors of the cerebello pontine angle, are tried to explain by pathophysiologic phenomena of the neural conduction. They are the pathologic fatigue of hearing, the disturbed excitability of the acustico facial stapedial reflex, the impaired velocity of nerve conduction, a poor synchronization of conduction as well as the excessively reduced monosyllabic and dichotic discrimination. With respect to the original tissue, localization, size as well as regional spread and growth pressure there result different constellations of symptoms, eventually only marked discretely. However, all 35 tumors of a defined observation period as well could be diagnosed solely by functional hearing tests.