中枢神经系统血管周细胞瘤的MRI诊断

MRI diagnosis of hemangiopericytoma in central nervous system

目的:探讨MRI诊断中枢神经系统血管周细胞瘤(HPC)的价值,提高对本病的认识。方法:分析7例经手术病理证实为HPC的MRI表现。所有患者均行MRI平扫及增强扫描。结果:6例位于颅内,1例位于颈段椎管内。T1WI示肿瘤呈等信号或稍高信号,T2WI呈等信号或稍高信号,增强扫描肿瘤实体部分强化明显。在颅内病例中,4例病灶内有斑片状囊变或坏死区;4例显示有血管流空或强化血管影;5例有瘤周水肿;2例病灶部分跨过天幕。结论:中枢神经系统HPC的MRI表现有一定的特征,有一定的提示诊断,但需与脑膜瘤鉴别,要注意分析其恶性征象,以提高术前诊断的正确率。

Objective：To improve the diagnostic accuracy of hemangiopericytoma（HPC） in the central nervous system by analyzing MRI features.Methods：The MRI features of 7 cases with HPC in central nervous system proved by operation and pathology were retrospectively analyzed.All the 7 cases were examined with both plain and enhanced MR scans.Results：6 of 7 cases were intracranial and 1 was cervical intraspinal.All of them showed isointense or slightly hyperintense signal on both T1 weighted and T2 weighted images.The solid portion of all the lesions showed strong enhancement after contrast agent was given.Among 6 intracranial cases,long T1 and long T2 signal appeared on 4 cases with necrotic or cystic change.Blood vessel flow void phenomenon or enhanced blood vessel was seen in 4 cases;and 5 cases showed perifocal edema.Intracranial lesions stride over the tentorium cerebelli in 2 cases;and hemorrhage appeared on 4 cases during surgical operation.Conclusion：HPC in the central nervous system have certain MRI features,which are helpful for suggesting the diagnosis.It should be differentiated with meningioma.Some malignant appearances should be observed carefully in order to improve the correct diagnostic rate.