cases, skin Week 230: Case 4 April 26, 2023 pathadmin 1. Presented by Ralph Hruban, M.D. and prepared by Natasha Rekhtman, M.D., Ph.D.This elderly patient developed a rapidly growing arm mass.Merkel cell carcinomaSmall cell carcinoma of the lung metastatic to skinLymphomaRhabdomyosarcoma 1. Presented by Ralph Hruban, M.D. and prepared by Natasha Rekhtman, M.D., Ph.D.This elderly patient developed a rapidly growing arm mass.