A rare case of multiple primary extragastrointestinal stromal tumors in the abdominopelvic cavity detected by 18F-FDG PET/CT.

An extragastrointestinal stromal tumor (EGIST) refers to the gastrointestinal stromal tumor in any location outside the gastrointestinal tract originates from mesenchymal tumors. The majority of the EGIST appeared as isolated mass, and multiple primary EGIST is quite rare. Here, we report a 36-year-old man of multiple EGIST in the abdominopelvic cavity, which was misdiagnosed as lymphoma on fluorine-18-fluorodeoxyglucose positron emission tomography/computed tomography (18F-FDG PET/CT) imaging. The patient received adjuvant drug treatment (imatinib, 400mg/day) for three months, and then further resection of all lesions was performed. No recurrence was found in CT follow-up one year after the operation.