摘要：目的：探讨马尾神经区肿瘤MR的表现特征，提高MR影像诊断及鉴别诊断水平。方法：分析经病理或临床证实确诊的50例马尾神经区肿瘤的MR表现特征。结果：脂肪瘤15例中12例合并先天畸形，2例可见马尾被包绕，2例无规律，3例MRM旋转呈矢状位可见蛛网膜下腔于一侧受压变窄。神经鞘瘤13例中有10例有囊变，增强扫描实质部分强化明显；2例马尾神经鞘MRM旋转观察示肿瘤上、下方的“脑脊液柱”里“杯口”状截断。神经纤维瘤7例中3例多发，肿瘤T1WI呈等或低信号，T2WI呈等或稍高信号。室管膜瘤5例，T1WI呈等或稍高信号，T2WI呈高信号，1例有囊变。脊膜瘤4例增强扫描呈明显强化，其中1例可见“脊膜尾征”，马尾显示欠佳。多发转移瘤2例MRM中示马尾神经区多发充盈缺损。胆脂瘤，副神经节瘤，淋巴瘤及血管瘤各1例，其中胆瘤无强化。结论：MR可清晰显示马尾神经区肿瘤的形态、MR信号特征、与马尾神经的关系及马尾的各种变化，对其诊断的鉴别诊断有较高价值。

    关键词:椎管肿瘤;马尾;磁共振成像

    Exploration the Diagnosis of MR of Cauda Tumors Equina

    HUANG Xun, WU Che-fu,XIE Qun-xian

    (The Department of Radiology, Zhanjiang Central People's Hospital, Guangdong Zhanjiang 524001, China)

    Abstract： Objective： In order to improve dingnostic ability,the MR imaging finding of cauda tumors were studied. Method： 50 pathologically clinically confirmed cases of tumors in the cauda area were examined with MR imaging. Results： Lipoma occurred in 15 cases of our series of patients and 12 cases out of the 15 showed congenited defect of various kinds simultaneously,lipoma enclosed the cauda equina in 2 cases,MRM demonstrated extradural lipoma in 3 cases .Among 13 cases of neurinoma there was cystic formatoin 10 cases ,constrast-enhanced images show that the tumas was intensively homogenows with rim enhancement,MRM demonstrated the intradural neurinomas appeared as filling defect and were sharply outline by cerebrospinal fluid in 2cases .7case of neurofribroma were found and there multiple lesions in 3 case .The tumor mass showed hypointense on T1WI and hyper or isointense on T2WI. There were 5 cases of ependymoma ,Ependymoma of the filum showed homogenous hyperintense as sligntly hyperintense on T2WI.There was cystic formation in the mass of one case of ependymoma.There were 4 cases of meningioma .The tumor mass showed homogenous enhancement after contrast enhanced scanning and meningeal tail sign was found in one case.MRM showed multiple small intradural extramedullary nodules in the cauda epuina showing filling defects sharply out-line by CSF in 2 cases .one case of hemangioblastoma showed iso intense on T1WI and hyperintense of T2WI relative to CSF.and it exhibited hemogenous enhancement after Gd-DTPA injection. In addition,one case of paraganioma and lymphoma and cholesteation with MR features was found. Conclusion： The imaging of MR is a very valuable method for the diagnosis and differental diagnosis of tumor in the cauda equina. ......