颅内血管外皮细胞瘤的CT和MRI诊断

目的：探讨颅内血管外皮细胞瘤（HPC）的CT及MRI特征。方法：回顾性分析经手术病理证实的16例颅内血管外皮细胞瘤患者的病例资料。所有患者均行CT平扫、MRI平扫、增强扫描及DWI检查，3例行MRA、MRV检查。结果：16例肿瘤均明显强化；15例有不同程度占位效应；14例外形波浪状分叶，2例呈类圆形；13例瘤内有囊变、坏死；10例可见瘤内血管流空信号。12例肿瘤T1WI上呈等低信号，4例呈高或略高信号；13例T2WI上呈混杂高信号，3例为等低信号；11例DWI上呈等低信号，5例为高信号。7例与脑膜以窄基底相连，9例与脑膜宽基底相连；4例邻近颅骨有破坏，4例可见脑膜尾征。结论：HPC的CT、MRI表现具有一定特征性，两种检查方法相结合有助于HPC的术前诊断。

CT and MRI diagnosis of Intracranial hemangiopericytoma

Objective：To assess the CT and MRI imaging characteristics of hemangiopericytoma （HPC）. Methods： Sixteen cases of HPC proven by pathology were reviewed retrospectively. All patients underwent un-enhanced MRI en- hanced MRI,DWI and CT scan. Three cases took MRA and MRV. Results： All 16 HPCs showed significant enhancement and 15 tumors had different degree of mass effect. Fourteen HPCs had wavy lobulated appearance and 2 tumors were round in shape. Thirteen tumors had necrosis and cystic change. Ten cases showed flow void phenomenon of the blood vessel in the tumor. Twelve cases showed isointense and hypointense signal and 4 cases showed hyperintense signal on T1WI; Thirteen cases showed mixed high signal and 3 cases showed isointense and hypointense signal on T2 WI;Eleven cases showed isoin- tense and hypointense signal and 5 cases showed hyperintense signal on DWI; Seven cases had connection with meninx through a narrow base and nine cases through a broad base; four cases had skull destruction near the tumor and 4 cases showed dural tail. Conclusion：The CT and MRI imaging of HPC has certain characteristics, and it could help to diagnosis before operation.