The radiographic findings in this 12 year old patient are compatible with osteosarcoma.

Osteosarcoma is the second most common primary bone tumor after multiple myeloma:

  • primary osteosarcoma: typically occurs in young patients (10-20 years) with 75% occurring before the age of 20
  • secondary osteosarcoma: occurs in the elderly, usually secondary to malignant degeneration of Paget disease, extensive bone infarcts or post-radiotherapy for other conditions

The most important differential considerations include :

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