cases, thymus Week 83: Case 4 April 26, 2023 pathadmin 1. Presented by Theresa Chan, M.D. and prepared by Jeffrey Seibel, M.D. Ph.D.74-year-old male with a mediastinal mass.Malignant germ cell tumorThymic carcinomaEwing sarcoma/Peripheral Neuroectodermal Tumor (PNET)Invasive thymoma 1. Presented by Theresa Chan, M.D. and prepared by Jeffrey Seibel, M.D. Ph.D.74-year-old male with a mediastinal mass.