cases, retroperitoneum Week 153: Case 5 April 26, 2023 pathadmin 1. Presented by Pedram Argani, M.D. and prepared by Sharon Swierczynski, M.D., Ph.D.41-year-old male with a retroperitoneal mass status post chemotherapy for germ cell tumorSeminoma with necrosisNecrotic tumor and paragangliaNecrotic tumor and paragangliomaNeuroendocrine carcinoma in a background of necrosis 1. Presented by Pedram Argani, M.D. and prepared by Sharon Swierczynski, M.D., Ph.D.41-year-old male with a retroperitoneal mass status post chemotherapy for germ cell tumor