摘要
目的：探讨纤维型脑膜瘤的MRI表现。方法：回顾性分析56例经郑州大学第一附属医院手术和病理证实的纤维型脑膜瘤的MRI平扫、增强和DWI表现。所有病例术前均行MRI常规横轴位T1WI、T2WI、DWI和增强后T1WI扫描。DWI序列扫描后获得ADC图，经后处理获得肿瘤实质和肿瘤对应正常脑白质的ADC值。分析纤维型脑膜瘤的常规MRI、DWI表现和ADC值。结果：56例纤维型脑膜瘤中，常规MRI扫描与正常大脑皮层比较，T1WI上，肿瘤呈等信号40例，略低信号14例，混杂信号2例；T2WI上，肿瘤呈等信号35例，略高信号12例，混杂信号6例，略低信号3例；出现瘤周水肿16例。增强T1WI上，34例均匀强化，21例不均匀强化，1例厚壁环形强化，脑膜尾征32例。DWI上，肿瘤呈等信号31例，稍高信号12例，混杂信号10例，低信号3例。ADC图上，肿瘤呈等信号31例，混杂信号15例，稍高信号6例，低信号4例。56例纤维型脑膜瘤肿瘤实质与正常脑白质ADC值之间的差异有统计学意义（P<0.05）；16例伴有瘤周水肿的纤维型脑膜瘤肿瘤实质、瘤周水肿、正常脑白质的ADC值之间的差异有统计学意义（P<0.05）。结论：纤维型脑膜瘤的DWI表现多种多样，DWI是常规MRI基础上诊断纤维型脑膜瘤的一种补充手段。
Abstract
Objective: To study MRI findings of fibrous meningioma. Methods: MRI findings of 56 cases fibrous meningioma confirmed by surgery and pathology were analyzed retrospectively. All patient underwent conventional axial T1WI, T2WI, DWI and enhanced MRI scan. ADC map was obtained from DWI sequence by post-processing and ADC values of tumor and normal white matter in corresponding area were acquired. Conventional MRI, DWI findings and ADC values of fibrous meningioma were analyzed. Results: Compared with brain cortex, the tumors were isointense in 40 cases, hypointense in 14 cases and mixed signal intensity in 2 cases on conventional T1WI of MRI. On T2WI, the tumors were isointense in 35 cases, slightly high signal intensity in 12 cases, mixed signal intensity in 6 cases and hypointensity in 3 cases. Peritumormal edema was found in 16 cases. On enhanced T1WI, 34 cases showed homogeneous enhancement, 21 cases showed heterogeneous enhancement and 1 case showed ring-like enhancement. Dural tail sign was seen in 32 cases. On DWI, 31 cases showed isointensity, 12 cases showed slightly high signal intensity, 10 cases showed mixed signal intensity and 3 cases showed low signal intensity. On ADC map, 31 cases had isointensity, 15 cases had mixed signal intensity, 6 cases had slightly high signal intensity and 4 cases were low signal intensity. The difference of ADC values between tumor parenchyma and normal white matter was statistically significant(P<0.05). In the 16 patients with peritumoral edema, the difference of ADC values among normal white matter, tumor parenchyma and peritumoral edema was statistically significant(P<0.05). Conclusions: There are various of DWI findings for fibrous meningioma. DWI can work as a supplement means for diagnosis of fibrous meningioma based on conventional MRI.
关键词
脑膜瘤 /
磁共振成像
Key words
Meningioma /
Magnetic resonance imaging
张晓楠;程敬亮;王斐斐;孙梦恬;林亚南;张风光;杨 璐.
纤维型脑膜瘤的磁共振成像表现[J]. 中国临床医学影像杂志. 2013, 24(2): 77-80
ZHANG Xiao-nan;CHENG Jing-liang;WANG Fei-fei;SUN Meng-tian;LIN Ya-nan;ZHANG Feng-guang;YANG Lu.
MRI findings of fibrous meningioma[J]. Journal of China Clinic Medical Imaging. 2013, 24(2): 77-80
中图分类号：
Ｒ739.45
Ｒ730.262
Ｒ445.2
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