肾嫌色细胞癌的CT和MRI诊断

The diagnosis of chromophobe cell renal carcinoma with CT and MRI

目的:探讨肾嫌色细胞癌的CT和MRI表现特点,提高对本病的认识。方法:回顾性分析16例经手术病理证实的肾嫌色细胞癌,16例均行CT平扫及增强扫描,6例同时行MRI检查。对比分析肾嫌色细胞癌瘤体、正常肾皮质、肾髓质的平扫、皮质期、皮髓交界期、肾盂期的强化情况并做对比分析,观察肾嫌色细胞癌瘤体的动态扫描特点。结果:正常肾皮质、正常肾髓质、嫌色细胞癌在CT平扫时,其CT值(HU)分别为30.7±3.2、28.5±2.8、32.7±5.6;增强皮质期分别为132.3±17.7、58.4±9.4、68.6±12.4;皮髓交界期分别为166.6±26.8、80.6±5.8、87.8±25.0;肾盂期分别为132.3±20.7、69.6±4.8、79.4±18.4;CT动态增强扫描肿瘤强化程度明显低于肾皮质,但高于肾髓质。T1WI示肿瘤呈低或等信号,T2WI呈等或稍高信号,MR动态增强特点与CT相似。结论:肾嫌色细胞癌CT、MRI表现具有一定的特点,综合分析其影像学表现,有助于提高该肿瘤的诊断符合率。

Objective：To investigate the CT and MRI features of chromophobe cell renal carcinoma（CCRC）,and learn more about of the disease.Methods：16 cases of chromophobe cell renal carcinoma were retrospectively analyzed.All of them were confirmed by pathology and performed CT scan.Six of them involved in MR.CT and MR features of the tumor were observed and analyzed.Results：CT values of the normal renal cortex,medulla and CCRC were（30.7±3.2）,（28.5±2.8） and（32.7±5.6）HU respectively on plain scan;CT values of them were（132.3±17.7）,（58.4±9.4） and（68.6±12.4）HU respectively in cortical phase;CT values of them were（166.6±26.8）,（80.6±5.8） and（87.8±25.0）HU respectively in medullary phase;CT values of them were（132.3±20.7）,（69.6±4.8） and（79.4±18.4）HU respectively in renipelvic phase.The enhancement of CCRC was lower than the normal renal cortex（cortical,medullary,renipelvic phase P0.01）,but higher than the normal renal medulla（cortical,medullary,renipelvic phase P0.05）.The tumor presented isointensity or hypointesity on T1-weighted image and isointensity or hyperintensity on T2-weighted image.Conclusion：The CT and MR characters of CCRC have special features so that they do some help to CCRC diagnosis.