cases, kidney Week 548: Case 1 April 26, 2023 pathadmin 1. Presented by George Netto, M.D. and prepared by Robert E LeBlanc, M.D.65 year old man with a 4.5 cm mass in the right kidney.Mixed epithelial stromal tumor (MEST)Cystic nephromaCollecting duct carcinoma (CDC)Tubulocystic carcinoma 1. Presented by George Netto, M.D. and prepared by Robert E LeBlanc, M.D.65 year old man with a 4.5 cm mass in the right kidney.