Magnetic Resonance Imaging in the Evaluation of Leptomeningeal Metastasis of Gliomas / 中国医师杂志

ABSTRACT

Objective To evaluate the characteristics of leptomeningeal metastasis of gliomas on magnetic resonance(MR) imaging and to provide evidence for clinical early diagnosis and treatment.Methods Twenty-one cases of intracranial gliomas with leptomeningeal metastases were scanned with conventional spin echo(SE) and fast spin echo(TSE),8 cases with fluid attenuated inversion recovery(FLAIR),and all of cases were operated with enhancement.Results ⑴ With MR plain scan,18 cases revealed vary range of distortion and illegibility structure of cerebral cistern and sulcus,and 6 cases revealed the asymmetrical enhancement of the wall of ventricle.Eleven meningeal neoplasms nodes were found in subarachnoid space in 7 cases,and some of the appearances could be seen in several cases.Eight cases of them were added with FLAIR,and the neoplasms nodes were showed more clearly and higher signal than TSE-T2W imaging.⑵ With MR enhancement,all cases with encephalic gliomas showed obvious enhancement with vary features of the enhancement of leptomeningeal metastasis,including tail sign(5/21),line sign(10/21),strip sign(3/21),node sign(7/21) and a few of cases included two signs.Conclusion It was very important for clinician to improve the cognition of MR imaging characteristics of leptomeningeal metastases of glioma,and to choose the proper MR imaging scan technique to increase the detection rate of early meningeal diseases.