后颅凹非典型室管膜瘤的CT和MR诊断  

CT and MRI diagnosis of posterior fossa atypical ependymoma

作　　者：鱼博浪[1] 张明[1] 罗琳[1] 王世捷[1] 朱丽萍 

机构地区：[1]西安医科大学第一临床学院影像中心,710061

出　　处：《中华放射学杂志》2000年第1期33-36,共4页Chinese Journal of Radiology

摘　　要：目的　分析后颅凹非典型性室管膜瘤的CT和MR影像学特点。方法　16例经手术病理证实的后颅凹非典型性室管膜瘤,行CT和(或)MR检查。男11例,女5例。年龄17～46岁,平均312岁,其中20～40岁者12例。临床主要表现眩晕、走路不稳和呕吐。结果　病灶12例位于小脑半球,3例位于小脑蚓部,1例位于桥小脑角。15例肿瘤为实质性,实质内有多灶性坏死囊变,1例呈囊性,位于桥小脑角。肿瘤多靠近小脑表面,与硬脑膜或小脑幕有较长的连接面。3例肿瘤内有钙化。CT扫描呈不均质混杂密度,MR扫描呈不均质混杂信号。增强扫描多呈轻度斑片状不均质强化,少数呈显著多环样不规则强化。结论　后颅凹非典型性室管膜瘤的特点是肿瘤位于小脑实质,多数肿瘤呈实质性,内有多发小灶性坏死囊变,CT和MR表现为混杂密度和混杂信号。鉴别诊断应考虑脑膜瘤、转移瘤和听神经瘤。Objective ToanalysetheCTandMRIfeaturesofposteriorfossaatypicalependymoma Methods SixteencasesofposteriorfossaatypicalependymomaprovedbysurgeryandpathologyhadCTand(or) MRIscanning Therewere 11malesand 5females Theagerangedfrom 17to 4 6(mean ,3 1 2 ) Twelvecases rangedfrom 2 0to 4 0yearsold Themainsymptomsofallcasesweredizziness ,unsteadywalkingandvomiting Results Thelocationsofallcaseswerecerebellum ( 12cases) ,vermis ( 3cases)andcerebellopontileangle ( 1case) Fifteencasesweresolidwithmultiplecysticchangesand 1caseinthecerebellopontileanglewascystic Thetumorwasusuallyclosetothesurfaceofcerebellumwithratherextensiveconnectionwithduramateror tentorium Calcificationswereshownin 3cases ThetumorsrevealedinhomogeneousdensityonCTscanand inhomogeneousintensityonMRI Mildinhomogeneousenhancementwasshowninmostcases,whileintense irregularenhancementintheothers Conclusions Thecharacteristicfindingsoftheposteriorfossaatypical ependymomaependymomawerecerebellarintraparenchymalmultiplesmallcysticchangeswithinsolidtumorin mostcasesandinhomogeneousdensityandintensityonCTandMRI Thedifferentialdiagnosisismeningioma , metastasisandacousticschwannoma

关 键 词：脑室管膜瘤 CT 磁共振成像 诊断 

分 类 号：R730.44[医药卫生—肿瘤]