College of American Pathologists

2011 — September Case of the Month

Posted September 6, 2011


CAP Foundation September 2011 Online Case of the Month

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A 49-year-old woman, with a radiologically aggressive pelvic mass underwent a left hemipelvectomy. A 15.0 x 11.0 x 9.0 cm tan-yellow mass occupying the medullary cavity of the iliac bone and extending into the surrounding soft tissues was identified. The cut surface of the mass was variegated tan-brown and myxoid with large foci of necrosis intermixed with areas having a more blue-gray chondroid appearance.

The master list with the correct answer

  • Chondroblastic osteosarcoma
  • Chondrosarcoma
  • Dedifferentiated chondrosarcoma
  • Enchondroma
  • Synovial chondromatosis

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  • Appropriate diagnosis
  • Critique
  • References

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