肾细胞癌MRI分析

目的分析肾细胞癌(简称肾癌)MR I信号特点。方法收集有完整临床资料及病理证实肾癌49例,均做T1W I、T2W I、STIR序列检查,同时27例做MR I动态增强扫描。结果透明细胞型41例,颗粒细胞型7例,肉瘤样细胞型1例。T1W I均匀等信号17例,混杂信号26例,均匀低信号6例;T2W I均匀略高信号19例,明显高信号4例,混杂信号26例。显示假包膜者10例。肾窦侵犯15例,肾周侵犯14例,肾静脉癌栓3例,腹膜后或肾门淋巴结肿大12例,腰大肌转移1例。注入造影剂后,8例病灶均匀强化,12例不均匀强化,3例均匀环状强化(包膜强化),4例强化环内壁不规则。结论仔细分析病灶的信号特点,MR I能够准确诊断肾癌,且能了解向肾窦、肾周侵犯及远处转移情况,尤其对小肾癌诊断,MR I价值独特。

MRI Analysis of Renal Cell Carcinoma

Objective To analyse MRI manifestations of renal cell carcinoma.Methods 49 cases of renal cell carcinoma proved by surgery and pathology were examined with MRI scan(including T_1WI,T_2WI and STIR) before operation,and 27 cases underwent MR contrast-enhanced scan.Results Of the 49 cases,there were clear cell carcinoma in 41,granular cell carcinoma in 7 and sarcomatoid renal carcinoma in 1.The tumors were inhomogeneous signal intensity in 26,isointensity in 17 and low signal intensity in 6 on T_1WI;while,slight high signal intensity in 19,inhomogeneous high signal intensity in 26 and clearly high signal intensity in 4 on T_2WI.Pseudocapsule was found in 10.Hilum renis and surrounding of ren were invaded in 15 and 14 respectively.Renal vein was embolized by carcinoma in 3.Metastasis of lymph nodes of retroperitoneum or hilum renis was in 12,and metastasis of psoas major muscles was in 1.After injection of contrast media,homogeneous enhancement was presented in 8,inhomogeneous enhancement in 12,homogeneous circular enhancement in 3 and inhomogeneous circular enhancement in 4.Conclusion By careful analysis of signal intensity of tumors,the evidence of renal cell carcinoma,surroundings involved by tumors and distant metastasis can be detected precisely by MRI.