The MR presentation and pathology comparison to atypical meningioma and anaplastic meningioma

MA Yonggang; CHEN Lijun; CHEN Shixin

Abstract：Objective To explore the MR presentation of the atypical meningioma and the anaplastic meningioma combined with pathological study. Methods It was performed by retrospective analysis to clinical and imaging data to six cases atypical meningioma and five cases of the anaplastic meningioma which all proved by pathology;all of the eleven cases hve been done by plain scan and enhancement scanning. Results In this six cases of atypical meningioma,two cases were in the convex cerebral hemisphere,one case was in the back of cerebellopontine angle,the other two cases were near by the cerebral falx,one case loca-ted in the longitudinal sinus. It was shown that the plain scanning MR presentations of the six atypical meningioma were homo-, low or slightly low signal on T1weighted images; homo-or high or slightly high signal on T2weighted images; The enhancement scanning showed focus of uniformity augmentation in 4 cases; one case presented blotch and institia augmentation in inner of tumour. The augmentation uneven focus in 1 case which all found calcification and capsula,five cases of the anaplastic meningio-ma existed in the convex of the cerebral hemisphere;The plain scan MR of this five cases of anaplastic meningioma presented une-ven homo-or slightly low signal on T1weighted images, homo-or slightly high signal on T2weighted images. one case presented augmentation irregual chaplet form by enhancement scanning. The focus of four cases presented uneven augmentation, in which there were three tumour capsula. Conclusion The images of the atypical meningioma and anaplastic meningioma presented dif-ferent imaging characteristics. Therefore,most of the presentations of MR are different. The two images can provide reliable help-ful reference to the clinic and the pathology.