Objective:To explore the different surgical approaches and postoperative results of trigeminal schwannomas originated from gasserian ganglion.Methods:A retrospective analysis of microsurgical treatment of 26 cases with trigeminal schwannomas originated from gasserian ganglion was performed.According to the tumor extensive and MR image,These cases were classified into two types:Type Ⅰ,the tumor originated from gasserian ganglion with major extension into the middle cranial fossa,with or without infiltration ...