目的 :探讨椎管内脊膜瘤MRI诊断及鉴别诊断。方法 :选择 18例经手术病理证实的椎管内脊膜瘤 ,观察肿瘤形态、边界、MRI信号特征、强化特征及与脊髓、硬膜囊、椎体附件的关系。结果 :脊膜瘤好发于女性 ,发病部位以上中胸段多见、颈段次之 ,髓外硬膜内脊膜瘤多呈扁丘状或椭圆形 ,其硬膜面平直 ,夹角多为钝角 ,其脊髓面圆钝 ,肿瘤纵径大于横径 ,可见“硬膜下”征 ,肿瘤少见囊变及出血信号 ;髓外硬膜外脊膜瘤多呈“哑铃”状向椎管外侵犯 ,致椎间孔扩大 ,患侧蛛网膜下腔变窄。注射Gd -DTPA后可见“硬膜尾”征及肿瘤脊髓面重度强化带。结论 :MRI对椎管内脊膜瘤定位准确 ;而椎管内脊膜瘤具有特征性MRI强化表现 ,因此 ,MR检查具有重要的定性诊断价值 Objective: To investigate MRI diagnosis and differential diagnosis of spinal meningeoma. Methods: Eighteen patients with spinal meningiomas confirmed by surgery and pathology were selected. The morphological features, border, MRI features, enhancement features and their relationship with spinal cord, dural sac and vertebral attachment were observed. Results: Spinal meningioma occurred in women, the incidence of more common in the mid-thoracic region, followed by the neck, extramedullary dura meningioma mostly flat-shaped or oval, the dura mater straight, angle Mostly obtuse, its rounded surface of the spinal cord, tumor longitudinal diameter greater than the diameter, showing “subdural” sign, tumor cystic change and bleeding rare signal; Extramedullary extradural membrane tumor mostly “dumbbells” to the spinal canal External invasion, caused by foraminal expansion, ipsilateral subarachnoid narrowing. After injection of Gd-DTPA visible “dural tail” signs and tumor spinal cord area with severe enhancement zone. CONCLUSIONS: MRI is accurate for the localization of spinal canal meningioma, while spinal canal meningioma has characteristic MRI enhancement. Therefore, MR examination has important qualitative diagnostic value