(A) At diagnosis, a 50×60 mm non-tender, non-itching, and dark red tumor with smooth surface was present on the right upper abdominal quadrant. (B) After the 3^rd session of cyclophosphamide, adriamycin, vincristine, and prednisolone (CHOP) chemotherapy, the tumor disappeared by gross examination. (C)¹⁸F-fluorodeoxyglucose (FDG) positron emission tomography (PET)/computed tomography (CT) scan shows a single hypermetabolic lesion (arrow) in the abdominal wall (standardized uptake value [SUV]=12.8).