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《Chinese Journal of CT and MRI》 2003-01
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Study of MRI findings and Diagnostic value of MR myelography of cauda equina tumors

YUAN Fei, WANG Shao-wu,XUE Cai-xia, SONG Qing-wei,KANG Jian-yun.The First Affiliated Hospital of DaLian Medical University, DaLian 116011,China[  
Objective In order to improve diagnostic ability,the MRI findingsof cauda equina tumors and the diagnostic value of MR myelography werestudied. Methods 56 pathologically clinically confirmed cases of tumors in thecauda equina area were examined with MRI.Among the 56 cases,7 were alsostudied with MR myelography(MRM). Results Among 16 cases of neurinoma,these was cystic formation in 9 cases.The mass of neurinoma was iso-orhypointense relative to the spinal cord on T1WI and iso-or hyperintense onT2WI.Contrast-enhanced images showed that the tumas mass was intensivelyhomogenous with rim enhancement.There were enlargement and enhancementof the cauda equina in 13 cases of neurinoma.MRM demonstrated the intraduralneurinomas appeared as filling defects and were sharply outlined by cerebrospinalfluid in 2 cases. There were 9 cases of ependymoma.Ependymoma of the filumshowed homogenous hyperintense as slightly hypes intense on T1WI andhypointense on T2WI.There was cystic formation in the mass of 2 cases ofependymoma.5 cases of neurofibroma were found and these were multiplelesions in 2 cases. The tumor mass showed hypointense on T1WI and hyper orisointense on T2WI. There were 4 cases of meningioma.The tumor massshowed homogenous enhancement after contrast enhanced scanning, and meningealfail sign was found in 1 cases.Lipoma occussed in 16 cases to our series ofpatients and 14 cases out of the 16 showed congenital defects of various kindssimaltaneously.Lipoma enclosed the cauda equina in 2 cases.MRM demonstratedextradural lipoma in 3 cases. These cases of multiple metastatic tumor occussedto our series.MRM showed multiple small intradural extramedullary nodules inthe cauda equina showing filling defects sharply outlined by CSF in 2 cases.One case of hemangioblastoma showed iso intense on T1WI and hyperintense onT2WI relative to CSF. There were empty blood vessels enveloping the conusmedullasis and cauda equina. In addition,there was one case of paragangliomaand one case of lymphoma with atypical MR features.One case of hemangiomashowed hyperintense on T1WI and isointense on T2WI relative to CSF, and itexhibited hemogenous enhancement after Gd-DTPA injection. Conclusion Thecombination of MRI and MRM is a very valuable method for the diagnosis anddifferential diagnosis of tumors in the cauda equina.[
【CateGory Index】: R739.4
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