Dr. Francisco Bengoa
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Soft-tissue tumors

Extraskeletal osteosarcoma

Soft tissueMalignant / sarcomaChondro-osseous tumours

Epidemiology

A rare soft-tissue sarcoma, more common in older adults, usually located deep in the thigh or pelvic girdle. Before surgery, it is confirmed that the tumor arises in soft tissue and does not correspond to extension from a nearby bone.

Basic features

It produces malignant osteoid without any connection to the neighboring bone, so imaging must confirm that it originates outside the bone.

Usual treatment

Treatment is based on wide resection; radiotherapy or chemotherapy are considered depending on size, grade, margins, and extent. Before chemotherapy starts it is worth discussing fertility preservation with the team, because some of these treatments can affect it and the options have to be raised beforehand.

Outcomes and prognosis

It carries a meaningful risk of local recurrence and metastasis and a guarded prognosis, so it needs close oncology follow-up.

Warning signs

These signs do not necessarily mean cancer, but they warrant evaluation before operating on or needling a mass.

  • A soft-tissue mass that grows, is larger than 5 cm, or is deep.
  • Persistent, night-time or progressive bone pain, especially if it limits activity.
  • A fracture from minimal trauma, or an aggressive bone lesion on an X-ray.
  • A lump that comes back after previous surgery.
  • Neurological symptoms, rapid swelling, or pain associated with a mass.

This information is general and does not replace a medical evaluation. A musculoskeletal tumor must be interpreted together with imaging, physical examination, biopsy when appropriate and each patient's context.

Specialist evaluation

If you have a mass, a bone lesion or a report suggesting a tumor, book an evaluation.

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