College of American Pathologists

2012 — March Case of the Month

Posted March 20, 2012

CLINICAL SUMMARY: Left pelvic soft tissue  

CAP Foundation March Online Case of the Month

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A 28-year-old woman with a radiologically aggressive left pelvic soft tissue mass underwent a resection. An 11.0 x 8.0 x 7.9 cm pericolonic mass with a 14.5 cm segment of sigmoid colon, left adrenal gland, and segment VIII of liver were received. The colon was not involved. The liver and adrenal gland contained metastatic tumor. Immunohistochemistry showed that the tumor cells were desmin +, smooth muscle actin +, and KIT –.

The master list with the correct answer

  • Extragastrointestinal stromal tumor
  • Fibrosarcoma
  • Leiomyosarcoma
  • Malignant peripheral nerve sheath tumor
  • Synovial sarcoma

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  • Appropriate diagnosis
  • Critique
  • References

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