乳头状肾癌的CT和MRI诊断

目的：探讨乳头状肾癌的CT和MRI表现，提高其诊断符合率。方法：回顾性分析13例经手术和病理证实的乳头状肾癌的CT和MRI影像资料。结果：CT检查7例，平扫呈软组织密度，增强后轻度强化。MRI检查8例，信号明显不均，以正常肾皮质信号为基准，6例表现为T1WI等或低信号，T2WI低信号改变。2例呈T1WI、T2WI混杂高信号改变，其镜下表现为广泛出血坏死灶。结论：乳头状肾癌属少血供病变，CT强化表现配合MRI T2WI混杂低信号改变有助于乳头状肾癌的临床诊断。

CT and MRI diagnosis of papillary renal cell carcinoma

Objective:To investgate the CT and MRI manifestations of papillary renal cell carcinoma for improving the diagnostic accuracy.Methods:CT or/and MRI examination were reviewed and analyzed in 13 cases of papillary renal cell carcinoma.All patients were confirmed by surgery and pathology.Results:Seven of 13 cases were performed CT,renal lesions showed soft tissue density and slight contrast enhancement.8 cases were performed MRI,lesions showed inhomogeneous signal intensity.Lesions appeared isointense or hypointense on T 1WI,and hypointense on T 2WI compared to that of renal cortex.In two cases the tumor appeared hyperintensity on T 1WI and T 2WI and the pathologic study revealed diffuse hemo- rrhage and necrosis.Conclusion:Papillary renal cell carcinomas tend to be hypovascular.Less enhancement scan together with heterogeneous hypointensity on T 2WI MRI can contribute to the diagnosis of papillary renal cell carcinoma.