肾嫌色细胞癌的多层螺旋CT表现

目的:挖掘肾嫌色细胞癌(ChRCC)的多层螺旋CT表现特点,提高其术前影像诊断准确性。方法:收集经手术病理诊断的ChRCC患者7例,男例3例,女4例,年龄48～70岁,平均55.1岁。术前均行4层或16层螺旋CT平扫、增强皮质期和实质期动态扫描。回顾性分析肿瘤大小、形态、密度、强化程度等CT征象,其中以肿瘤的相对强化程度评价肿瘤强化表现。结果:肿瘤轴位长径14.8～89.9mm,平均50.0mm,边界均清楚、光整。平扫等密度或略高密度,密度均匀5例,不均匀2例。不均匀2例中,1例为体积最大者,边缘少许小钙化,内见坏死囊变区及条片状瘢痕,另1例内见星状瘢痕。增强扫描皮质期及实质期病灶轻度强化6例,明显强化1例,均匀强化5例,不均匀2例。增强皮质期病灶/肾皮质密度比值平均为0.544,增强实质期病灶/肾皮质密度比值平均为0.494。结论:ChRCC瘤体密度较均匀,轻度强化,瘤内钙化、出血及坏死囊变者少,CT对其诊断可提供重要线索。

MSCT Findings of Chromophobe Renal Cell Carcinoma

Purpose:To identify the imaging characteristics related to the histology of chromophobe renal cell carcinoma(ChRCC) with multi-slice spiral computed tomography(MSCT).Methods:Seven patients with ChRCC confirmed by operative pathology were collected,including 3 men and 4 women,age ranged from 48 - 70 years with mean age 55.1 years.Before operation,all patients were underwent plain and corticomedullary and parenchymal phase dynamic CT examinations using a 4 - or 16 - slice spiral CT scanner.The multi - slice spiral CT findings,such as the tumor size,shape,density and enhancement were retrospectively analyzed,and the relative tumor enhancement was evaluated.Results:Major diameters of tumors on axial position ranged from 14.8 - 89.9mm,with average 50.0mm.All tumors showed well - defined borders.Homogeneous density was observed in 5 lesions,and 2 lesions were heterogeneous. Of the two heterogeneous tumors,one was the biggest with small calcification,small cyst and scar,another one was with central scar.Six tumors were slightly enhanced and one was enhanced heavily on the corticomedullary and parenchymal phases after administration of contrast medium.Five tumors were homogeneously enhanced,and two were heterogeneously enhanced.The average tumor - to - cortex enhancement ratio at corticomedullary and parenchymal phases were 0.544 and 0.494,respectively.Conclusion:The CT features of ChRCC,which include homogeneous,slightly enhancement,less calcification and hemorrhage, and less necrosis and liquefaction,may provide clues to diagnosis ChRCC.