Meningioma is a derivative of meninges and interstitial meninges, mostly from arachnoid cells, and is the second most common intracranial tumor, accounting for 19.2% of all tumors, second only to glioma. In recent years, with the development and popularization of imaging technology, the incidence of meningioma has increased significantly, especially in the elderly, with a female:male ratio of 2:1 and a peak incidence age of 45 years old, which is rare in children. The treatment of meningioma is mainly surgical and combined with the following factors: ① tumor is not in the skull base, such as convex surface, pars falciformis, paranasal sinus, intracerebroventricular meningioma, etc., should strive for early surgery and total resection of tumor; ② tumor in the skull base, located in the saddle node, olfactory groove, pterygoid plateau, pterygoid crest, pontocerebellar angle meningioma, etc. should be operated early, for pterygoid crest flat meningioma, slope meningioma flat type, if there is no high cranial pressure syndrome. Surgery can be postponed. What is the grading of meningioma surgery? Grading of surgical resection of meningioma: In order to judge the efficacy and prognosis of surgery, some scholars have proposed the following surgical grading criteria, which are now adopted: Grade I: complete sarco-ocular resection of tumor, including resection of dura mater and cranium adhering to the tumor and the involved venous sinus; Grade II: complete sarco-ocular resection of tumor, with only electrocoagulation and cautery of dura mater adhering to the tumor; Grade III: complete sarco-ocular resection of tumor, without resection or electrocoagulation of dura mater adhering to the tumor, with involvement of venous sinus. Grade IV: partial resection of tumor; Grade V: cranial decompression only, either biopsy or no biopsy of tumor. What are the surgical grading of meningioma? Meningioma recurrence after surgery: Most meningiomas can be completely resected and cured, and even those that cannot be completely resected can be in remission for a longer period of time. However, some meningiomas are prone to recurrence, with recurrence rates ranging from 9% to 32% even in those with grade I or II surgical resection. Radiation therapy is effective for meningiomas that are not fully resected and for meningiomas that cannot be surgically recurred.