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Osteosarcoma is a type of bone cancer that develops in the osteoblast cells that form the outer covering of bone. It occurs most often in children, adolescents and young adults and represents more than one-third of all bone tumors.

Osteosarcoma most commonly occurs in the long bones around the knee. Other sites for osteosarcoma include the upper leg, or thighbone, the lower leg, upper arm bone, or any bone in the body, including those in the pelvis, shoulder and skull.

Osteosarcoma may spread into nearby tendons or muscles. It may also metastasize through the bloodstream to other organs or bones in the body.

Symptoms of osteosarcoma may include:

  • Pain in the affected bone
  • Swelling around the affected site
  • Increased pain with activity or lifting
  • Limping
  • Decreased movement of the affected limb

The symptoms of osteosarcoma may resemble other medical conditions, such as Ewing sarcoma. Always consult your physician for a diagnosis.