Atypical meningioma, a lesion that is intermediate between benign and malignant meningiomas. It is characterized by significantly more active cell growth than benign meningiomas. In addition, it is invasive to brain tissue but does not have abnormal division and abnormal differentiation of proliferating cancer cells. Therefore, its pathological type is clearly distinguished from benign and malignant meningiomas. Clinically it has such imaging features that are different from benign meningioma. Most benign meningiomas are homogeneous in texture and have regular borders. Most of them are proliferative and destructive to the skull. However, atypical meningiomas have an irregular morphology, the border is not particularly smooth and rounded, and they are invasive to the brain tissue. In addition, cystic degeneration and necrosis may occur, but calcification is less frequent, but its symptoms appear earlier because it grows more rapidly, so the onset cycle is shorter. Once this atypical meningioma is detected, patients are advised to seek timely medical attention and early surgery to prevent it from developing into a malignant lesion. If the pathological type of meningioma is atypical after the first surgery, then it should be reviewed regularly after surgery, usually at 1 month, 3 months, 6 months and 1 year after surgery, and should be dealt with at any time once there are signs of recurrence. Atypical meningiomas are unstable and have a tendency to become malignant. Therefore, it is important to seek early medical attention for this type of atypical meningioma.