Imaging Distinguish Of Renal Angiomyolipoma With Minimal Fat And Renal Cell Carcinoma

Objective:To analyze imaging of renal angiomyolipoma with minimal fat and renal cell carcinoma,then improve ability of differential diganosis.Materials and Methods:The US,CT and MRI features of 7 patients with renal angiomyolipoma with minimal fat and 133 patients with renal carcinoma,proved by operation and pathology,were retrospectively studied.Results:All seven patients with renal angiomyolipoma with minimal fat showed homogeneous isoechogenicity on sonograms,homogeneously high attenuation on unenhanced CT images,and homogeneous enhancement on contrast-enhanced CT images,and five patients showed prolonged enhancement.No one contained calcification.Two of the angiomyolipomas were examined with MR images,and both were hypointense on T2-weighted images.Of the 133 renal cell carcinomas,23 contained calcification.And two renal cell carcinomas showed homogeneously high attenuation on unenhanced CT images,and homogeneous enhancement and prolonged enhancement on contrast-enhanced CT images,but none of them showed homogeneous isoechogenicity on sonograms.Twelve renal cell carcinomas performed MR images,of which,11 showed homogeneous herperintensity,isointensity or heterogeneous signal intensity on T2-weighted images and only one were hypointense.Conclusion:According to the analysis of the US,CT and MRI features,it is available to differentiate most of the renal angiomyolipoma with minimal fat and renal cell carcinoma.