College of American Pathologists
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2010 — January Case of the Month

Updated January 11, 2010


CAP Foundation January 2010 Online Case of the Month

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A 48-year-old woman presented with a large painless thigh mass, which was excised. Grossly, the mass was a well circumscribed,lobulated 17.7 x 15.2 x 11.8 cm unencapsulated tumor with a slightly yellow and gelatinous cut surface and focal areas of hemorrhage.

The master list with the correct answer

  • Intramuscular myxoma
  • Lipoblastoma / Lipoblastomatosis
  • Myxoid chondrosarcoma
  • Myxoid dermatofibrosarcoma protuberans (DFSP)
  • Myxoid liposarcoma
  • Myxoid malignant fibrous histiocytoma

  • Spindle cell lipoma

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  • Appropriate diagnosis
  • Critique
  • References

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