小肾癌的MR表现  

MR diagnosis of small renal cell carcinoma

作　　者：王霄英[1] 范诒忠 梁妍[3] 崔爱国[1] 蒋学祥[1] 

机构地区：[1]北京大学第一医院医学影像科,北京100034 [2]河北省清河县第二医院MR室 [3]吉林省长春市人民医院放射科

出　　处：《中国医学影像技术》2004年第8期1223-1225,共3页Chinese Journal of Medical Imaging Technology

摘　　要：目的　研究小肾癌 (直径 <3cm )的MR表现。方法　 19例手术病理证实的小肾癌患者 ,肿瘤直径均 <3cm ,术前 1个月内行MR检查 ,将手术病理结果与MR表现进行对照研究。结果　 19例患者均被MR检出 ,14例边界清楚 ,5例部分边界不清。MR假包膜显示率为 85 .71% ( 12 / 14 )。平扫信号无特征性。 6例MR增强扫描中 ,2例不均匀强化 ,其增强程度低于肾实质 ;2例未见明显强化 ;2例为囊性 ,增强后囊壁及分隔有强化。MR分期诊断准确率为 78.94% ( 15 / 19)。结论　MR可显示小肾癌的边界和信号特点 。ObjectiveTo evaluate the MR appearances of small renal cell carcinoma (sRCC) (<3 cm). MethodsNineteen patients with pathologically proved sRCCs were examined by MR within 1 month before surgery of nephrectomy. The MR appearances and pathological results were studied. ResultsAll sRCCs were detected in MR images. Forteen sRCCs were clearly defined and 5 were not. Forteen sRCCs had pseudocapsule pathologically, and the demonstration rate of sRCC was 85.71% (12/14) with MR. Signal intensities of sRCC were as following: low T1 and high T2 signal in 4, intermediate T1 and slightly high T2 signal in 3, intermediate T1 and slightly low T2 signal in 3, slightly high T1 and slightly high T2 signal in 2, slightly high T1 and low T2 in 1, cystic signal in 2 and inhomogeneous signal in 4. After intravenous administration of contrast media, the signal intensities of the lesions were as following: 2 were inhomogeneously enhanced but less than that of the normal renal cortex; 2 were not enhanced obviously; 2 cysts were enhanced in the regions of the cystic wall and the septum. According to the surgical results, 12 cases were stage Ⅰ, 6 were stage Ⅱ and 1 was stage Ⅲ. The accuracy rate of MR in staging of sRCCs was 78.94% (15/19). ConclusionMR is helpful in the detection and staging of sRCCs.

关 键 词：肾癌 磁共振成像 

分 类 号：R737.11[医药卫生—肿瘤] R445.2[医药卫生—临床医学]