颅内血管周细胞瘤的MRI诊断

目的探讨颅内血管周细胞瘤的MRI特征,提高对该病的诊断准确性。方法收集经手术病理证实的血管周细胞瘤7例,均行MR平扫加增强扫描。结果 7例中,6例位于颅内脑外,1例位于左侧脑室三角部;肿瘤多呈分叶状;MRIT1WI呈等或稍低信号,T2WI呈稍高信号,5例见明显囊变、坏死区;4例可见明显水肿;增强扫描实性部分明显强化,其内及周边可见较多的血管;5例窄基底与硬膜相连,1例宽基底与硬膜相连,2例见"脑膜尾征"。结论颅内血管周细胞瘤的MRI表现有一定的特征性,分析其特点有助于提高术前诊断的准确性。

MRI Diagnosis of Hemangiopericytoma in Central Nervous System

Objective To improve the diagnostic accuracy of hemangiopericytoma（HPC） in the central nervous system by analying MRI features.Methods MRI characteristic in 7 pathologically proved hemangiopericytoma（HPC） were analyzed.All of 7 cases were examed both plain and enhanced MRI scans.Results There were intracranial and trigone of left lateral ventricles in 6 and 1 cases respectively.All of cases showed lobulared borders.The masses were slight hypointensity or isointensity signal on T1WI and slight hyperintensity on T2WI.The cysts and necrosis were marked edema.The other two cases showed homogeneous signal.Tumors solid component enhanced after injection of intraveneous contrast material and blood vessel were observed in all masses.5 cases connected to the narrow base of dura,and 1 case with broader base;2 cases showed dural tail sign？ Conclusion HPC in the central nervous system have certain MRI features,which are helpful in preoperative diagnosis.