Step 1

Musculoskeletal 3

A 17-year-old boy presents to his primary care physician for evaluation of swelling and pain in his left thigh, which began 7 weeks ago. Past medical history is significant for retinoblastoma, which was successfully treated with cryotherapy at 19 months of age. Physical examination reveals focal tenderness and swelling over the left distal femur, and radiographs of the region show a lesion with periosteal new bone formation in a “sunburst” pattern.

Which of the following describes the most likely lesion in this patient?

  • A) Ewing sarcoma
  • B) Osteoblastoma
  • C) Osteochondroma
  • D) Osteoid osteoma
  • E) Osteosarcoma


Alexandra Conway


Dr. Ted O'Connell

Last updated

Dec 29, 2023

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