肾盂癌MRI表现

MRI Manifestations of Renipelvic Carcinoma

目的:分析肾盂癌的MRI信号特点。方法:搜集有完整临床资料及经病理证实的肾盂癌32例,均作T1WI、T2WI、STIR序列检查,其中15例作MRI动态增强检查,层厚/间距:8/0mm。必要时为4/0mm。结果:移形上皮细胞癌28例,鳞状上皮细胞癌3例,腺癌1例。T1WI均匀低信号21例,混杂信号7例,均匀等信号4例。T2WI均匀高信号20例,混杂高信号7例,等信号5例。腹膜后淋巴结转移5例,肾门淋巴结转移2例。注入对比剂后,皮质期均匀强化10例,不均匀强化5例;实质期及肾盂期13例病灶强化程度几乎没有改变,2例增强程度明显提高。MRU,肾盏饱满积水6例,肾盂积水扩张4例,肾盂内充盈缺损影3例。结论:仔细分析病灶信号特点,MRI能够准确诊断肾盂癌且能了解向肾实质及远处转移情况。

Objective： To respectively study the MRI manifestations of renipelvic carcinoma. Methods： 32 surgically and pathologically proved cases of renipelvic carcinoma were examined with MRI pre-operatively. All of the cases were scanned with T1WI.T2WI and STIR sequences,and enhancing scans were performed in 15 of the cases. Results： In these 32 cases, there were 28 cases of transitional cell carcinoma,2 cases of squamous cell carcinoma and 1 case of adenocarcinoma. On T1 WI images, the carcinoma presented as homogeneous low signal intensity masses in 21 cases, heterogeneous signal intensity ones in 7 cases,isointense signal intensity ones in 4 cases. On T2 WI images, the tumors showed homogeneous high signal intensity in 20 cases,inhomogeneous high signal intensity in 7 cases and isointense signal intensity in 5 cases. Metastatic retroperitoneal and renal hilar lymph nodes were found in 5 and 2 cases respectively. Postcontrastly,homogeneous enhancement was presented in 10 cases,while inhomogeneous enhancement in 5 cases in cortical phase;intensity of enhancement was obviously elevated in 2 cases in parenchymal and pyelographic phases. On MRU,caliectasis was presented in 6 cases. hydronephrosis in 4 cases and renal pelvic irregular filling defect in 3 cases. Conclusion：Through a detailed study on the features of MR signal intensity of the lesions, MRI of renipelvic carcinoma was capable of providing precise information on tumor specific diagnosis and its invasion to renal parenchyma and surroundings.