Objective To investigate the advantage of cerebellomedullary fissure approach to resect the space occupying lesion in the fourth ventricle region and at the back of pons and to discuss the microsurgical skills.

• 目的 探讨经小脑延髓裂入路切除桥脑背侧及第四脑室内占位性病变手术的优点及显微手术技巧。