男, 33岁。偶然发现左顶部局限性包块 1年余,逐　　讨论:脑膜瘤是起自脑膜的中胚层肿瘤,良性者影像学表现多较典型,诊断不难。恶性脑膜瘤较为少见,仅占脑膜瘤的1% ~2% [1],男性多见,男女之比为 8 1,发病年龄低于良性脑膜瘤,平均 28岁。其特点为生长迅速,可向颅外转移,甚 Male, 33 years old. Occasionally found the top of the left top of the limitations of more than 1 year, by the discussion: Meningioma is a mesodermal tumor from the meninges, benign imaging findings are more typical, the diagnosis is not difficult. Malignant meningiomas are relatively rare, accounting for only 1% to 2% of meningioma [1], more common in men, the ratio of male to female 8 1, the age of onset lower than the benign meningioma, with an average of 28 years. It is characterized by rapid growth, can be transferred to the extracranial, very