颅内血管外皮细胞瘤的MRI诊断

MRI Diagnosis of Intracranial Hemangiopericytoma

目的探讨颅内血管外皮细胞瘤(hemangiopericytoma,HPC)的MRI特征,提高其诊断的准确率。方法回顾性分析经手术病理证实的11例颅内HPC的MRI表现。结果 11例肿瘤均位于颅内脑外,9例(81.82%)肿块呈多分叶状,MR T1WI上呈不均匀等或稍低信号,T2WI上呈不均匀等或稍高信号;7例(63.64%)于扩散加权成像(DWI)上呈混杂等或稍高信号,10例(90.91%)肿瘤内部或边缘可见明显流空血管影。增强扫描11例均呈明显不均匀强化,仅2例(18.18%)示"脑膜尾征"。结论颅内HPC的MRI表现有一定的特征性,有助于提高HPC的术前诊断率。

Objective To investigate the MRI features of the intracranial hemangiopericytoma（HPC）and to improve the diagnostic accuracy.Methods The MRI features of 11 cases of intracranial HPC proved by operation and pathology were retrospectively analyzed.Results All the tumors were extra axial intracranial tumors.9 masses（81.82%）were lobulated shape.Tumors showed hypo or isointensity on T1WI,heterogenous iso or hyperintensity on T2WI.7 cases（63.64%）were heterogeneous iso or hyperintensity on DWI.10 cases（90.91%）had vascular void flow in and surrounding the tumors.All cases were hetergenous enhanced,only 2 lesions（2/11,18.18%）had ＂dural tail＂ sign.Conclusion The MR imaging findings of intracranial hemangiopericytoma has some characteristics,which would facilitate the diagnosis of HPC preoperatively.