It is a common intracranial site for meningiomas, which can cause epilepsy, numbness or weakness in the hands and feet, and headaches that may or may not be present. Because of the close relationship with the sagittal sinus (the major reflux vein in the skull) and the fact that the tumor is often surrounded by other reflux veins that drain blood to the sagittal sinus, intraoperative damage to the veins is likely to occur and the tumor is not easily removed to avoid vascular damage. If the venous return can be re-established in the later stage, the limb paralysis will gradually improve. The relationship between tumor and sagittal sinus is mainly in three cases: 1. the tumor is close to the sagittal sinus without invading the vascular wall of the sagittal sinus; 2. the tumor invades the vascular wall of the sagittal sinus and the blood flow of the sagittal sinus is not completely occluded; 3. the tumor invades the vascular wall of the sagittal sinus and the blood flow of the sagittal sinus is completely occluded; the second and third cases are most likely to have residual tumor. The surgery is done under the microscope, and the postoperative complications can be minimized by certain surgical techniques paying attention to protect the sagittal sinus and its returning vessels, as well as the cerebral cortex around the tumor. Another parasagittal sinus meningioma before and after surgery (the tumor is in a pushing relationship with the sagittal sinus, but the tumor breaks through the midline to the contralateral side via the falx cerebri).