复习了２０例资料完整经手术和病理证实的恶性脑膜瘤，综合分析其ＣＴ表现为：（１）肿瘤外形不规则，有分叶结节状凸起，边界不清；（２）肿瘤内低密度区及脑膜瘤的非均一强化或环状强化；（３）明显的瘤周水肿；（４）肿瘤侵犯颅骨及颅外软组织。讨论了恶性脑膜瘤的ＣＴ表现与病理组织学关系以及诊断与鉴别诊断。 Twenty cases of malignant meningioma confirmed by operation and pathology were reviewed. The CT findings of them were as follows: (1) The irregular shape of the tumor with lobulated nodular prominence and unclear boundary; (2) low tumor Density area and meningioma heterogeneous enhancement or ring enhancement; (3) obvious peritumoral edema; (4) tumor invasion of skull and extracranial soft tissue. Discuss the relationship between malignant meningiomas CT features and histopathology diagnosis and differential diagnosis.