cases, mediastinum Week 36: Case 3 April 26, 2023 pathadmin 1. Presented by Elizabeth Montgomery, M.D. and prepared by Angelique W. Levi, M.D.Painless neck mass in a 46 year old woman. At surgery, a smooth firm encapsulated white mass was found deep to the heads of the sternocleidomastoid muscle./images/4.2.01.EMcase3b.jpg/images/4.2.01.EMcase3c.jpg/images/4.2.01.EMcase3d.jpgMetastatic squamous cell carcinomaBiphasic synovial sarcomaEctopic hamartomatous thymomaDedifferentiated liposarcoma with epithelial elements Loading...