College of American Pathologists
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2009 — March Case of the Month

Updated February 13, 2009


CAP Foundation March 2009 Online Case of the Month

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A large protuberant abdominal mass was discovered in an 83-year-old man who was examined by the Emergency Department for transient ischemic attack. Subsequent exploratory laparotomy revealed a solid mass that replaced the omentum. Received was a 27.0 x 23.0 x 13.0 cm solid, rubbery, tan and white mass with irregular borders that infiltrated omental adipose tissue. The tumor had the following immuno-histochemical profile: S100(-), CD117(-), CD34(+), CK(-), SMA(-), Factor VIII (-), Calretinin(-), BCL-2(+), EMA(-), WT-1(-), CD31(-).

The master list with the correct answer

  • Angiosarcoma
  • Gastrointestinal stromal tumor
  • Hemangiopericytoma
  • Malignant peripheral nerve sheath tumor
  • Malignant solitary fibrous tumor
  • Sarcomatoid mesothelioma
  • Sarcomatoid renal cell carcinoma

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  • Appropriate diagnosis
  • Critique
  • References

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