Jejunal Undifferentiated Spindle Cell Sarcoma with Intussusception Revealed by 18F-FDG PET/CT

Spindle cell sarcoma is malignant tumor with low incidence. They can occur in soft tissue, bone, or viscera. The characteristics of morphology, density, and metabolic about spindle cell sarcoma are related to the location where the lesion is. A 61-year-old woman presented with vomiting after eating for 2 weeks. Signs of peritoneal irritation involved but no response for symptomatic treatment included antiemetic and antispasmodic therapy. Abdomen CT indicated that there was a mass in the intestinal tract in the pelvic cavity. Then 18F-FDG PET/CT was performed and interestingly detected a jejunal malignancy mass in left upper abdomen with annular high uptake of 18F-FDG, which complicated with intussusception and intestinal obstruction. And finally, jejunal mass was clarified pathologically as undifferentiated spindle cell sarcoma.