椎管内髓外硬膜下原发肿瘤的低场MRI诊断

Low-field MRI Diagnosis of Primary Spinal Subdural Tumors

目的:探讨MR I对椎管髓外硬膜下原发肿瘤的诊断价值。方法:分析经手术病理证实的12例髓外原发肿瘤的MR I表现。结果:MR I定位准确率为100%,5例神经源性肿瘤,呈长T1长T2信号,具有异常对比增强;3例脊膜瘤,呈等长T1等长T2信号,具有十分明显异常对比增强,由于脊膜瘤可有钙化,MR I信号强度可以不均匀;2例蛛网膜囊肿,与脑脊液信号相一致,不具有异常对比增强;1例脂肪瘤,呈圆形短T1稍长T2信号,不具有异常对比增强;1例血肿,呈短T1长T2信号,不具有异常对比增强。结论:根据椎管内髓外原发肿瘤的MR I表现,可准确定位并可推测其病理类型,为临床手术提供可靠的参考价值。

Objective： To evaluate low - field MRI in the diagnosis of primary spinal subdural tumors. Method： MRI findings in 12 patients with pathologically proved primary spinal subdural tumors. Result： The accuracy of localizing diagnosis was 100%, Five neurogenic tumor showed longer TI and longer T2 sig- nals with abnormal contrast enhancement. Three meningiomas showed iso - or longer T1 and iso - or longer T2 with signal of meningiomas can be inhomogeneous because it has calcification. Two arachnoid cyst showed homogenous signal intensity identical to CSF without abnormal contrast enhancement. One adipose tumor dis- played shorter T1 and slightly longer signals with round and without abnormal constrast enhancement. One hematoma showed shorter T1 and longer T2 signals without abnormal contrast enhancement. Conclusion： Based on its MRI features ,the primary spinal subdural tumor can be precisely located and its pathological type,which is very helpful for the clinical operation.