Pathogenesis A spinal meningioma grows confined within the spinal canal with an intact envelope, adheres closely to the dura mater, and has a wide base. The tumor tissue does not invade the spinal cord parenchyma but only compresses it. The blood flow of the tumor comes from the vascular supply of the arachnoid or dura mater and is relatively abundant. Most tumors are solitary, but multiple tumors are rare. The tumor is usually small, mostly flat and oval in shape, and the tumor is dense and hard in structure, with gray-red color on the surface. Sometimes there are calcified sand grains at the base of the tumor, and hemorrhagic necrosis within the tumor is less common. Most of the spinal meningiomas are located in the dura mater, a few are located outside the dura mater, and dumbbell-shaped is less common. Forty-four cases of spinal meningioma were reported, of which 42 were located within the dura mater, only one was located outside the dura mater, and the other case was dumbbell-shaped, located both inside and outside the dura mater. Microscopic examination: The histology of spinal meningioma is approximately the same as that of intracranial meningioma. There are three types as follows: 1. Endothelial type The tumor is made of polygonal endothelial cells arranged in a mosaic, sometimes with swirling structures. The tumor cells are well differentiated. This type of spinal meningioma mostly originates from the arachnoid endothelium. Fibroblastic tumors are composed of staggered arrangement of spindle-shaped cells, rich in reticular fibers and collagen fibers, sometimes with glass-like changes. This type of spinal meningioma mostly originates from the fibroblasts of the dura mater. 3.Grit type Grit type spinal meningioma is based on endothelial type or fiber type, with scattered majority of grit vesicles. Clinical manifestations of spinal meningioma Spinal meningioma grows slowly and the early symptoms are not obvious, so the medical history is usually long. The common first symptom is numbness of the limb where the tumor is located, followed by weakness, with radicular pain taking the third place. Among the 44 cases reported, the first symptom was numbness of limbs in 23 cases, accounting for 49.9%; weakness of limbs in 11 cases, accounting for 27.3%, and radicular pain in 10 cases, accounting for 22.8%. The symptoms and progression of spinal cord compression are similar to the progression of spinal cord neurofibroma.