Magnetic Resonance Image Manifestations of the Atypical Meningioma

Abstract

Through retrospective analysis of 13 cases of magnetic resonance image (MRI) manifestations of atypicalmeningiomas confirmed by operation and pathology in the First Affiliated Hospital of Xinxiang MedicalUniversity, the objective of this study was to evaluate the diagnostic value of MRI in order to improve the accuracyrate of preoperative diagnosis. In this retrospective analysis of MRI findings for atypical meningiomas in FirstAffiliated Hospital of Xinxiang Medical University from January to July in 2012, the location, morphologyand tumor signals and other tumor imaging characteristics were covered. In 13 cases of atypical meningiomapatients of this group, most tumors were located at typical sites (10/13), mainly the falx cerebri, parasagittal,convexity, saddle area. Only two cases were at atypical locations, 1 in the cerebellar hemisphere and 1 in a lateralventricle. Most of the tumors showed T1 and T2 isointensity signals, and necrosis, calcification, and peritumoraledema were always featured. DWI showed isointensity in 11 cases (11/13), and hyperintensity in 2. Some 9 caseshad dural tail signs, 12 had accurate positioning (12/13), and 2 were postoperative recurrences. MRI has highvalue in the diagnosis of atypical meningiomas, with important roles in early clinical diagnosis, treatment andprognosis evaluation.