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MR diffusion-weighted imaging in differential diagnosis of intracranial cystic lesions
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- Author:
- No author available
- Journal Title:
- CHINESE JOURNAL OF RADIOLOGY
- Issue:
- 7
- DOI:
- 10.3760/j.issn:1005-1201.2007.07.003
- Key Word:
- 脑脓肿;脑肿瘤;表皮囊肿;蛛网膜囊肿;磁共振成像;扩散
Abstract： 目的 探讨MR扩散加权成像(DWI)在颅内囊性病变中的鉴别诊断价值.方法 对76例经临床及手术病理证实的颅内囊性病变患者,行常规MR、DWI及增强MR检查,其中脑脓肿19例,原发性脑胶质瘤20例,小脑血管母细胞瘤4例,脑转移瘤10例,蛛网膜囊肿7例,表皮样囊肿16例.回顾性分析颅内囊性病变的DWI信号特征,定量测定囊性变区表观扩散系数(ADC)值.结果 DWI上19例脑脓肿呈高信号;34例脑肿瘤患者中,除3例脑胶质瘤呈高信号、1例呈等信号,1例脑转移瘤呈高信号外,其余29例均呈低信号.各种病变ADC值分别为:脑脓肿(0.62±0.15)×10-3mm2/s、脑胶质瘤(2.39±0.78)×10-3mm2/s、脑血管母细胞瘤(2.68±0.40)×10-3mm2/s、脑转移瘤(2.79±0.79)×10-3mm2/s.脑脓肿与脑胶质瘤、脑血管母细胞瘤、脑转移瘤的囊变坏死区ADC值比较,差异均有统计学意义(P＜0.01);脑胶质瘤与脑血管母细胞瘤、脑转移瘤的囊变坏死区ADC值比较,差异均无统计学意义(P＞0.05).7例颅内蛛网膜囊肿的DWI呈低信号;16例表皮样囊肿DWI呈明显高信号.颅内蛛网膜囊肿和表皮样囊肿的ADC值分别为(2.96±0.36)×10-3mm2/s和(0.94±0.13)×10-3mm2/s,二者之间差异有统计学意义(P＜0.01).结论 DWI及ADC值对鉴别脑脓肿和囊性或坏死性脑肿瘤具有重要的价值,DWI表现为低信号的颅内囊性病变可除外脑脓肿.
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