非典型性脑膜瘤CT与MRI表现  

CT and MRI Findings of Atypical Meningioma

作　　者：王宏琢[1] 邱士军[1] 王燕钰[1] 梁艺[1] 

机构地区：[1]南方医科大学南方医院影像中心,广东广州510515

出　　处：《实用放射学杂志》2009年第10期1396-1399,共4页Journal of Practical Radiology

摘　　要：目的探讨非典型性脑膜瘤的CT及MRI表现特点，提高诊断的准确性。方法回顾分析经手术病理证实的25例非典型性脑膜瘤的MRI资料与其中5例CT资料。结果本组患者25例，男13例，女12例，年龄30～68岁，平均46岁。幕上23例，幕下2例。25例均行MRI扫描，T1WI低信号14例，等信号10例，1例稍高信号；T2WI稍高信号14例，高信号7例，等高混杂信号4例；增强后不均匀明显强化15例，不均匀轻到中度强化5例，均匀明显强化4例，1例花环状强化；轻度瘤周水肿15例，中度4例，重度3例，3例周围未见水肿。5例行CT扫描，平扫均呈略高密度，3例内部见小片低密度坏死，2例可见多个囊状坏死区；4例行增强扫描，均呈不均匀明显强化；3例可见邻近颅骨受侵。结论非典型性脑膜瘤大多具有特征性的CT与高场MRI表现。Objective To investigate CT and MRI characteristics of atypical meningioma,so that to improve the diagnostic accuracy of it. Methods 25 cases with atypical meningioma confirmed by pathology were studied retrospectively. All cases underwent MRI and 5 cases underwent CT examinations. Results There were 13 men and 12 women,ranged from 30 to 68 years old in age with average of 46 years. The lesions of 23 cases were located at supratentorial region and 2 located at infratentorial. The lesions demonstra- ted hypointensity（14 cases）, isointensity（ 10 cases） or slightly hyperintensity（1case） on T1WI, and slightly hyperintensity（ 14 cases）, hyperintensity（7 cases） or mixed signal（4 cases） on T2WI. After Gd--DTPA injection,obvious inhomogeneous enhancement, obvious homogeneous enhancement and slight inhomogeneous enhancement were showed in 15, 4 and 5 cases respectively, and 1 case showed peripheral and homogeneous enhancement. Slight peri-tumorous edema was found in 15 cases, moderate edema in 4 cases and marked edema in 3 patients, other 3 cases showed no peri- tumorous edema. The lesions showed high density on plain CT scan, three of them showed small pieces of low density,2 cases showed multiple cystic necrosis. 4 of them underwent contrast-enhanced CT, and the lesions showed as uneven strong enhancement the,lesions invaded the skull in 3 cases. Conclusion The most of atypical meningiomas is of characteristics on CT and MRI.

关 键 词：脑 非典型性脑膜瘤 磁共振成像 体层摄影术 X线计算机 

分 类 号：R739.45[医药卫生—肿瘤] R445.2[医药卫生—临床医学]