MRI findings of dysembryoplastic neuroepithelial tumor

NIE Mei; CHEN Zi-qian; XIAO Hui; XIA Jia-lin

Abstract：Objective To summarize the MRI manifestations of eight cases of dysembryoplastic neuroepithelial tumors (DNET) so as to improve awareness of the disease .Methods We retrospectively analyzed eight cases of DNET ,which were confirmed pathologically and summarized their imaging characteristics .Results 8 cases of DNET were involved the cerebral cortex ,which presented with clear boundary and were devoided of peritumoral edema or mass effectiveness .Of these 8 cases ,4 cases were locted in the temporal lobe ,2 cases in occipital lobe ,1 case in frontal lobe ,and 1 case in cere-bellum .5 cases presented with the "triangle sign",4 cases had "separated"sign ,and 3 cases were shown to be a single or multiple cystic .Tumors were hypointensity on T1WI and hyperintensity on T2WI .After contrast enhancement ,4 cases were shown no enhancement ,4 cases were shown to be linear ,separated shape ,and small nodular enhancement .On T2-FLAIR ,7 cases appeared visible signal "ring sign"in the tumor periphery .Conclusion The MRI findings of DNET have certain characteristics of imaging findings ,which are important for accurate diagnosis of tumors before surgery .