Intra-abdominal desmoid tumors mimicking gastrointestinal stromal tumors — 8 cases: A case report

Figure 1 Abdominal computed tomography and ¹⁸fluorodeoxyglucose-positron emission tomography revealed intra-abdominal desmoid tumors in patients with gastrointestinal stromal tumors, showing well-defined ovoid shaped masses with delayed or mild enhancement on computed tomography and mild or absence of hypermetabolic activity on ¹⁸fluorodeoxyglucose-positron emission tomography. A: Patient 7: A 40-year-old female patient presented with small bowel gastrointestinal stromal tumors (GIST) with metastasis in the peritoneum, liver, and ovary. Pelvic lobulated masses with heterogeneous enhancement were observed on computed tomography; B: Initial GIST lesions showed hypermetabolic activity on ¹⁸fluorodeoxyglucose-positron emission tomography (¹⁸FDG-PET); C: A new single mass occurred in the pelvic peritoneum; D: The maximum standardized uptake values was 2.7 as shown on ¹⁸FDG-PET; E: The dose of imatinib was escalated to 800 mg/d and the size of desmoid tumors was stable for approximately 1.3 years. ¹⁸FDG-PET: ¹⁸Fluorodeoxyglucose-positron emission tomography; GIST: Gastrointestinal stromal tumors.