MRI and pathological characteristics of angiomatous meningioma

HU Miaomiao; LYU Lulu; LI Mei; WU Shiyong; ZHENG Yinyuan; SHI Yibing

Abstract：Objective To evaluate MRI performances and pathological characteristics of angiomatous meningioma.Methods We retrospectively analyzed the conventional MRI, DWI, ADC values and pathological manifestations of 9 cases of angiomatous meningiomas confirmed pathologically.Results Of 9 cases of angiomatous meningiomas,5 cases were located in convexity of brain,1 case in sphenoid ridge and 3 cases beside cerebral falx.There were 7 cases displayed hypointense on T 1WI and hyperin-tense on T2WI except 2 cases displayed isointense on T 1WI and T2WI.Seven cases manifested flowing void phenomenon,6 cases showed significant peritumoral edema,2 cases displayed necrosis within the tumors.Seven tumors displayed significant enhance-ment on contrast-enhanced T1WI and all cases showed iso-or hyperintense on DWI sequence.The average ADC value of the tumors was higher than the contralateral normal parenchyma(1.29×10-3mm2/s vs.0.89×10-3mm2/s,t =8.32,P <0.01). All tumors were composed of massive micro vessels on pathologic examination.Vimentin and epithelial membrane antigen were positive in all cases.Conclusion Angiomatous meningioma has characteristic structures in pathology and performances on MRI. Combining analysis of conventional MRI,DWI and ADC can help to make a correct diagnosis of this tumor.