College of American Pathologists

2010 — May Case of the Month

Posted May 05, 2010


CAP Foundation May 2010 Online Case of the Month

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A 78-year-old man with a history of Paget disease of bone involving both hips, complained of increasingly severe pain in his right hip for about six weeks. He was admitted for total hip arthroplasty. During surgery a large mass was identified, arising from the iliac crest and wrapping around the sciatic nerve. Multiple fragments of yellow/pink, fleshy tissue measuring 9.0 x 7.0 x 2.5 cm in greatest dimensions were submitted for examination.

The master list with the correct answer

  • Fibrous dysplasia
  • Malignant fibrous histiocytoma of bone
  • Mesenchymal chondrosarcoma
  • Osteoid osteoma
  • Osteosarcoma
  • Reactive changes secondary to infection

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  • Appropriate diagnosis
  • Critique
  • References

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