Gastrointestinal stromal tumor (GIST) - metastatic
Vague abdominal pain, progressive abdominal distension and tightness, weight loss, loss of appetite, early satiety, constipation. No fevers, chills, nausea, or vomiting.
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Large, predominantly cystic mass, occupying majority of the peritoneal cavity. Irregular, enhancing, heterogeneous soft tissue components around the periphery of the mass with largest soft tissue mass in the left upper quadrant near the stomach. The large mass abuts gastric body, liver, pancreas, colon, and small bowel loops. Multiple enhancing peritoneal soft tissue nodules. Small pelvic ascites.
The mass was surgically resected and was found to be malignant gastric GIST with metastatic implants within the omentum, peritoneum, appendix, liver, stomach, colon, small bowel, mesentery. During the surgery, the mass was opened and drained clear reddish brown liquid from necrosis.