Abstract
A 57-year-old woman was admitted with a diagnosis of ileus due to an adhesion. Abdominal CT scan showed sigmoid colon and liver tumors. Therefore, a sigmoidectomy and an adhesiotomy were performed. On pathology, a sigmoid colon cancer was diagnosed ; the patient received chemotherapy. Subsequently, the liver tumor completely disappeared. However, 1-year after the operation tumor maker levels were found to be elevated ; CT scan revealed no evidence of tumor recurrence. Nevertheless, PET/CT detected intense FDG uptake at the paraaortic lymph node, and sigmoid colon cancer recurrence was suspected. Chemotherapy was restarted, and PET/CT was performed again. FDG uptake was decreased at the paraaortic node, and there was no intense uptake in other area. Radical surgery was performed, and on pathology, a foreign body granuloma (FBG) was found. Post malignant tumor surgery, FDG uptake by FBG can mimic tumor recurrence.
