RESUMEN
PURPOSE: To find the CT and US findings of multilocular cystic renal cell carcinoma. MATERIAL AND METHODS: We retrospectively analysed CT and US findings of five cases of the pathologically proven multilocular cystic renal cell carcinoma. We analysed CT and US with view points of tumor margin, growth pattern, renal contour change, echogenicity, attenuation on pre- and postcontrast scan, thickness and number of septum, and perirenal change. RESULTS: The CT findings of the multilocular cystic renal cell carcinoma were large well defined round encapsulated multiple fluid filled cystic mass with exophytic growing pattern. The capsule and septum were relatively well enhanced with contrast medium. The cystic space and septurn were variable in size and shape. US revealed large multiple fluid filled cystic mass separated by echogenic septum. CONCLUSION: The above CT and US findings of multilocular cystic renal cell carcinoma may be helpful in the diagnosis.