5 cases of tumors of the cerebellopontine angle were subjected to stereotactic puncture and biopsy for various reasons (preoperative differential diagnostic difficulties, cyst evacuation, evaluation of the effect of stereotactic radiosurgery). Material for cytology was aspirated in all 5 cases; in addition, a spiral biopsy was obtained in 2. The specimens enabled a satisfactory morphological judgement in 4 cases, while in 1 case the emptying of a cyst did not provide adequate material. No untoward effects were observed.

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