Meningiomas are usually found in the parsagittal sinus, the convex surface of the brain, the pars falcae, followed by the pterygoid crest, the saddle node, the olfactory groove, the pontocerebellar horn and the cerebellar curtain. Other sites are occasionally seen. Benign meningioma grows slowly and has a long course. Patients often have headache and epilepsy as the first symptoms, and depending on the location of the tumor, they may have visual, visual field, olfactory or auditory disturbances and limb movement disorders. In elderly patients, epilepsy is the first symptom. Meningioma cells are known to have estrogen receptors, progesterone receptors, androgen receptors and glucocorticoid receptors. Because increased progesterone in the blood is common in malignant meningiomas, meningiomas with significant peritumoral edema on CT, and increased progesterone can contribute to worsening signs and symptoms in meningioma patients, anti-progesterone agents have been proposed to treat recurrent meningiomas or surgically incomplete meningiomas in an attempt to slow tumor growth. In general, tumors larger than 3 cm are treated by surgery, while tumors smaller than 3 cm and located deep in the brain with no obvious clinical symptoms can be considered for r-knife treatment, and patients who cannot be completely removed by surgery can also be treated with adjuvant r-knife therapy after surgery.