Just an Ortho resident. SS typically is a slow growing soft tissue mass that sometimes can take 2-4 years before diagnosis, and some people have a history of trauma to the area. Occurs in peri-articular regions around knee, shoulder, arm, elbow, foot. It can arise from tendon sheaths, bursa, fascia, and joint capsule, but only rarely involves a joint. Treated with wide resection and radiation as well as chemotherapy. 5-year survival = 50%, 10-year survival = 25%
As far as connection with Melanoma, not aware of a correlation, but not totally sure.