颅内血管外皮细胞瘤MRI特征

MRI Features of Intracranial Hemangiopericytoma

目的回顾分析颅内血管外皮细胞瘤(hemangiopericytom as,HPC)及脑膜瘤的MRI表现,以获得对颅内HPC的诊断及鉴别诊断具有价值的MR I特征。资料与方法选取经病理证实的颅内HPC患者11例及脑膜瘤患者107例。用2χ检验、Fisher确切概率法对比分析两组之间差异是否存在统计学意义。结果颅内HPC的MRI表现:肿瘤呈分叶状9例(81.8%),7例(63.6%)肿瘤以窄基底附着硬膜上,7例(63.6%)肿瘤内部呈迂曲的血管信号,8例(72.7%)肿瘤内囊变、坏死,7例(63.6%)T2W I呈等高信号,8例(72.7%)扩散加权成像(DW I)呈高信号;增强扫描肿瘤明显强化11例(100%),5例(45.5%)可见瘤周水肿。肿瘤形态(P<0.01)、肿瘤内部迂曲的血管信号(P<0.01)、T2WI信号强度(P<0.05)及DWI信号强度(P<0.01)在两组之间差异有显著统计学意义。结论颅内HPC的MRI表现具有一定特征性。肿瘤形态、T2WI及DW I信号、肿瘤内部迂曲的血管信号是鉴别颅内HPC及脑膜瘤的重要征象。

Objective To evaluate the MR features of intracranial hemangiopericytomas and meningiomas in order to improve its diagnostic accuracy.Materials and Methods The MRI findings of 11 cases with intracranial hemangiopericytomas and 107 cases with meningiomas verified by pathology were retrospectively analyzed.The data were evaluated by using χ2 test or the Fisher exact test.Results MRI features of intracranial HPC included： shape of tumor（multilobulated,81,8%）,the type of dural attachment（narrow-based,63.6%）,internal serpentine signal voids（63.6%）,cystic degeneration or necrosis in tumor（72.7%）,iso-and hyperintensity on T2WI（63.6%）,hyperintensity on DWI（72.7%）,markedly enhancing（100%）,peritumoral edema（45.5%）.Shape of tumor,internal serpentine signal voids,T2WI and DWI signal intensity showed significant difference（P0.05 or P0.01）between the two groups.Conclusion Intracranial hemangiopericytomas have typical MRI features.Shape of tumor,internal serpentine signal voids,T2WI and DWI signal intensity are the important characteristics for differentiating intracranial hemangiopericytomas from meningiomas.