Classic osteosarcoma: diagnosis and treatment overview

It often begins near the end of a long bone, particularly around the knee, although it can arise elsewhere. Diagnosis requires imaging and a carefully planned biopsy reviewed by a pathologist experienced in bone tumours.

The defining microscopic feature is malignant tumour cells making osteoid. The word classic commonly refers to a conventional high-grade osteosarcoma arising within the bone. A pathology report may describe osteoblastic, chondroblastic, or fibroblastic areas, but these appearances are interpreted alongside the tumour grade, surgical margins, imaging, and response to treatment.

Scans assess the affected bone, nearby soft tissues, the lungs, and other bones when indicated. This information shows the local extent and whether disease is present elsewhere. A fracture through the affected bone can change surgical planning, but it does not replace formal staging.

Referral to a bone sarcoma team should happen before biopsy or surgery. The biopsy route is chosen so it can be removed during the definitive operation and does not compromise future limb-sparing options. Treatment commonly combines chemotherapy with tumour removal surgery. Surgeons aim to remove the cancer with a rim of healthy tissue while preserving useful function when feasible. The team may reconstruct the bone or joint and arrange physiotherapy and rehabilitation. Pathologists examine the removed tumour to assess margins and its response to preoperative therapy.

Osteosarcoma commonly presents with persistent localised bone pain and swelling, sometimes with reduced movement near a joint. Arrange assessment when pain continues, worsens at night, or is accompanied by a growing firm swelling. Sudden severe pain, inability to bear weight, or a visibly deformed limb may indicate a fracture and needs urgent care. During chemotherapy, fever, shaking chills, breathlessness, unusual bleeding, or inability to keep fluids down should be reported promptly to the oncology service.

Consider asking who will plan the biopsy, where the tumour sits in relation to nerves and blood vessels, and whether limb-sparing surgery is technically possible. Clarify the chemotherapy sequence, the reconstruction choices, expected effects on movement, rehabilitation support, fertility considerations, and how scans will be used after treatment.