Overview Ewing (YOO-ing) sarcoma is a rare type of cancer that occurs in bones or in the soft tissue around the bones. This cancer most often begins in the long bones of the pelvis, legs or arms, but it can occur in any bone. Less often, Ewing sarcoma starts in the soft tissues of the arms, legs, abdomen or other locations.
https://www.mayoclinic.org/diseases-conditions/ewing-sarcoma/symptoms-causes/syc-20351071