cases, retroperitoneum Week 368: Case 1 April 26, 2023 pathadmin 1. Presented by Peter Illei, M.D. and prepared by Joseph J. Maleszewski, M.D.50 y.o. woman with a large (16.0 cm) retroperitoneal mass surrounding the left kidney.images/jjm101308/case1a.jpgimages/jjm101308/case1b.jpgimages/jjm101308/case1c.jpgimages/jjm101308/case1d.jpgMalignant angiomyolipomaLeiomyosarcomaMalignant Gastrointestinal Stromal Tumor (GIST)Sarcomatoid renal cell carcinoma Loading...