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 –.
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• Extragastrointestinal stromal tumor
• Malignant peripheral nerve sheath tumor
• Synovial sarcoma
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