Ms. Wang had meningioma surgery in 2015, and the doctor told her that the tumor was benign and could be cured by cutting it clean. However, not long ago, during the routine review, the doctor told her that the tumor had recurred. She was depressed, why would a benign tumor recur? Meningioma is a benign tumor, and neurosurgery generally tries to cut cleanly in the treatment of benign tumors. However, meningiomas are more likely to occur in the convex surface and skull base, and if the skull base involves some nerves and blood vessels, or if the large blood vessels in the sagittal sinus in the convex surface grow very closely, because the function of blood vessels and nerves must be preserved, the surgery may not be able to make a complete incision, and a part of the tumor may remain, which is likely to be the cause of recurrence. There is also a type of meningioma that erodes the bone, which is an aggressive meningioma. If the bone is removed during surgery, for example, if the dura mater is eroded, the dura mater will be removed, which may also cause recurrence because the blood vessels and nerves are too close to each other and cause residual. However, experienced surgeons will find ways to cut the tumor cleanly, for example, if it is too close to a blood vessel, the surgeon will ensure that the tumor is cut cleanly first through means such as revascularization. For aggressive meningiomas, the resection will be expanded, and if it is a grade 2 or higher meningioma, the patient will also be asked to undergo further radiation therapy after surgery.