摘要
目的：探讨MRI环形强化的高级别胶质瘤的DWI信号特点。方法：对19例高级别胶质瘤环形强化区域的DWI信号进行回顾分析，按照图像特点分4种情况：①强化环形与DWI信号区域的对应关系；②环的形态规则或不规则；③环的外形有无张力；④环壁为闭环或开环；MRI检查序列为T2WI，T2WI-FLAIR，T1WI，DWI，T1WI抑脂增强。结果：19例患者MRI增强均呈环形强化，DWI高信号区与环形强化区范围基本一致或超过强化范围的有16例，DWI高信号区小于环形强化区范围的3例；DWI高信号呈环形且无张力的12例，DWI高信号呈环形且有张力的1例，DWI高信号不呈环形导致无法判断有无张力的6例；DWI高信号呈环形且形态不规则的12例，DWI高信号呈环形且形态规则的1例，DWI高信号不呈环形导致不好判断的6例；DWI高信号呈环形且环的形态连续（闭环）11例，DWI高信号呈环形且环的形态不连续（开环）2例，DWI高信号不呈环形导致不好判断的6例。结论：环形强化的高级别胶质瘤，DWI高信号范围一般都与强化大致一致或超过其范围；DWI呈环形高信号时，其环的形态多不规则、呈无张力、多为闭环等特点，如病变伴出血时其DWI信号上述环形特点不明显，这些影像特征对颅内高级别胶质瘤的诊断有非常重要的提示价值。
Abstract
Objective: To investigate the characteristics of DWI signals in high grade gliomas with ring enhancement on MRI. Methods: DWI signals within ring enhanced areas in 19 cases of high grade gliomas were analyzed retrospectively. They were divided into 4 situations according to the image features. They were as followed: regional corresponding relation between the ring enhancement and DWI signal; regular or irregular shape of rings; with tension or not concerning on the ring shape; the ring wall is closed or not; MRI sequences included T2WI, T2WI-FLAIR, T1WI, DWI, enhanced T1WI with fat suppression. Results: All 19 cases showed ring enhancement on enhanced MRI. 16 cases showed high signal intensities on DWI which accorded or exceeded the scope of ring enhancement. DWI hyperintense area was smaller than the enhancement area in 3 cases. DWI high signal area showed a ring shape with no tension in 12 cases and with tension in 1 case. 6 cases did not show ring-like hyperintense area on DWI or their tension not to be judged. Hyperintense rings on DWI were irregular in 12 cases and regular in 1 case. No hypertense rings on DWI were formed in 6 cases which led to bad judgement; Hyperintense rings on DWI(closed loops) were found continuous in 11 cases and interrupted(open loop) in 2 cases. Conclusion: In high grade gliomas with ring enhancement, DWI high signal areas generally accorded to the enhancement or exceeded its range. When DWI showed a hyperintense ring, its characteristics were irregular in shape, with no tension and a closed loop. Hemorrhage could cause unobvious characteristics of the ring on DWI. There is much value for these imaging features in the diagnosis of intracranial high grade gliomas.
关键词
脑肿瘤 /
神经胶质瘤 /
磁共振成像 /
弥散
Key words
Brain neoplasms /
Glioma /
Diffusion magnetic resonance imaging
杨 宇;周知慧;李 平;娄 昕.
MRI环形强化的高级别胶质瘤的DWI信号探讨[J]. 中国临床医学影像杂志. 2015, 26(1): 5-8
YANG Yu;ZHOU Zhi-hui;LI Ping;LOU Xin.
Investigation on DWI signals of high grade glioma with ring enhancement on MRI[J]. Journal of China Clinic Medical Imaging. 2015, 26(1): 5-8
中图分类号：
Ｒ739.41
R730.264
Ｒ445.2
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