The authors have evaluated early results of gamma knife treatment of forty − four cases of acoustic neurinoma by fOllOW − Up MRIS and ChangeS in the neUrOlOgiCal S 正 gnS eVery three mOnthS , The fOllOW − Up periOd ranged betWeen 3to 22 months ( mean :12 months ) , Enhanced MRI ( T 璽 WI ) at 3 to 6 months postoperatively revealed a region of low intensity at the center of tumor , which was re − enhanced at g to 12 months . Thereafter , in llcases ( 25% )the tumor size gradually decreased . As

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... side effects , facial nerve palsy after the radiosurgery appeared in 7 cases after the radiosurgery , three of which had been improving. Trigeminal nerve palsy was found in 3 cases . With regard to hearing , a deterioration of hearing was found in ll out of 21 cases that showed hearing disturbances . Apathological study was made of one treated tumor , which was removed by surgery Ilmonths after the treatmenし The findings included complete necrosis at the center of the tumor and degeneration of the tumor cells and vessels at the periphery of the tumQr .