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Ege Üniversitesi Tıp Fakültesi Nöroşirürji Anabilim Dalı, İzmir Acoustic neurinoma arise from the neurilemmal sheath of the superior division of the vestibular nerve at the junction of central and peripheral myelin. This tumour mostly arises from the vestibular nerve and rarely from the cohlear nerve. Some authors have suggested different classifications of this tumour regarding with their size, their intracanalicular localization and clinical signs and symptoms. Sami et al. have made a classification in which tumours are divided into two sub groups, the first one is smaller than 3x2 cm, the second one is bigger than 3x2 cm. Sami also classified this tumours according to their invasion to the adjacent tissues (27, 39, 40, 41). Spetzler et. al has made a classification according to tumour size and divided this tumour in to four grades (24). These tumours causes early symptoms, when placed intracanallicularly, but cause late period symptoms when placed at the cerebellopontine angle. Anahtar Kelimeler : Neurinoma, Acoustic neurinoma, Intraoperative monitoring