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[Unusual circumstances of disclosure of acoustic neurinoma].

While progressive unilateral deafness remains the most typical symptom of the development of acoustic neuroma, the study of at least 1,200 cases operated since 1966 shows that in at least 16.5% of all cases, the triggering signal to seek medical advice was either otologic but atypical, or non-otologic but including symptoms in another pair of cranial nerves, or without any apparent relationship with the area showing a tumor of the eight pair, or even occurring under etiological circumstances that were misleading at first.