Ewing sarcoma occurs when cancer develops in bones or soft tissue. Most Ewing sarcoma tumors eventually cause a lump under the skin. These lumps are soft and may feel warm to the touch. Soft tissue ...

Sarcoma is a type of cancer that originates in the bones or soft tissue. Soft tissue sarcoma (STS) most often begins in the arms and legs but can also occur in other body parts. Soft tissues include ...