MRI diagnosis of malignant meningioma / 实用放射学杂志

ABSTRACT

Objective To analyze the MRI characteristics of malignant meningiomas,and to improve the level of diagnosis and differential diagnosis.Methods MRI data of 20 patients with malignant meningiomas proved by operation and pathological results were analyzed. Results Of 20 patients,meningiomas were located at the sagittal sinus and convexity of brain in 11 cases and 4 cases respectively.7 cases had regular shape,13 cases had irregular shape.The border was clear in 9 cases,ill defined in 11 cases.11 cases had hypointensity on T1WI, 10 cases had hyperintensity on T2WI.5 cases had obvious necrosis and cystic degenoration,2 cases had hemorrhage inside the tumor. Homogeneous enhancement were seen in 12 cases,heterogeneous enhancement were seen in 5 cases,ring-enhancement were seen in 2 cases and 1 cystic lesion without enhancement.16 cases showed dural tail sign.16 cases had peritumoral brain edema in different degree,4 cases had no peritumoral brain edema.4 cases invaded adjacent skull.1 case had relapsed.Conclusion Malignant meningiomas have some characteristic on MRI,know well it's characteristics of MRI can be helpful to improve the diagnostic accuracy.