According to the anatomical relationship between the location of tumor growth and the spinal cord and dura mater, intradural tumors can be divided into 3 types, namely extradural tumors, extramedullary subdural tumors and intramedullary tumors. Intramedullary tumors grow inside the spinal cord, and astrocytomas and ventricular meningiomas are common, followed by vascular reticulocytomas, cavernous hemangiomas, lipomas, etc. Surgical resection often requires incision of the spinal cord, which requires exploration and separation of intradural tumors and often causes different degrees of damage to the fragile spinal cord tissue. The prognosis of astrocytoma is worse than that of intramedullary tumors. Chen Xin, Department of Brain and Spine Surgery, Cancer Hospital of Fudan University, China Extramedullary subdural tumors include neurogenic tumors (including neurofibromas and nerve sheath tumors) and spinal meningiomas; extradural tumors include nerve sheath tumors and spinal meningiomas, followed by hemangiomas, lipomas and metastases. Compared with intramedullary tumors, surgery can cause less damage to the spinal cord, faster recovery of neurological function, and better prognosis.