四脑室占位病变的MR诊断  

MRI diagnosis of fourth ventricular masses

作　　者：温智勇[1] 齐旭红[1] 张雪梅[1] 毕冬梅[1] 

机构地区：[1]北京电力总医院放射科,北京100073

出　　处：《中国CT和MRI杂志》2011年第4期11-13,共3页Chinese Journal of CT and MRI

摘　　要：目的探讨四脑室占位病变的MRI影像学特征及鉴别诊断。方法回顾性分析90例四脑室占位病变的MRI影像学表现,其中经手术证实83例;经三名以上专门从事神经放射诊断工作的主任医师、副主任医师确诊7例。结果本组病例中包括:髓母细胞瘤(27例)、室管膜瘤(18例)、脉络丛乳头状瘤(11例)、转移瘤(7例)、星形细胞瘤(6例)、胶质瘤(混合型或未分类5例)、表皮样囊肿(5例)、脑囊虫(4例)、海绵状血管瘤(4例)、静脉血管畸形(3例)。肿瘤形态呈类圆形及不规则形,可为实性或囊实性。增强检查多数病灶可强化,少数无明显强化。结论四脑室病变的诊断主要依据MRI的影像学征象。在诊断时注意区分原发于四脑室内或外侵至四脑室的病变,以利于鉴别诊断。Objective The purpose of this study was to discuss MRI characteristics and differential diagnosis of tburth ventricular masses. Methods We analyzed retrospectively 90 casesi- MRI findings of fourth ventricular masses that were proved by the surgery （n = 83） or were diagnosed by more than three professors and assistant professor that are mainly in the neuroradiology field （n = 7）. Results These masses in our study included the medulloblastomas （n=27）, the ependymomas （n=18）, the choroid plexus papillomas （n=11 ）, the metastases （n=7）, astrocytomas （n=6）, glioma （undifferentiated and mixed patten are 5 cases）, epidermoid cysts （n=5）, cerebral cysticemosis （n=4）, cavernous hemangiomas （n=4） and venous malformation （n=3）. Their shapes are spheroidal or irregular and, some masses could become cystic changes in the masses. Most masses could be enhanced or a few couldn＇t be enhanced with DTPA on MRI. Conclusion We think that to demonstrate the fourth ventricular must depend on MR findings. It is also important to differentiate these masses within or without fourth ventricular for the differential diagnosis.

关 键 词：四脑室 占位 诊断 磁共振成像 

分 类 号：R73[医药卫生—肿瘤] R445.2[医药卫生—临床医学]