A 54-year-old man presented with a 2-month history of painless swelling of the right abdomen that had persistent right epigastric pain radiating toward the dorsal shoulder, with no jaundice. He had a history of diabetes for 8 years and was taking metformin, a hypoglycemic drug. A clinical diagnosis of the abdominal abscess ( Figure 1A, yellow arrow) caused by acute cholecystitis (Figure 1A, white arrow) was confirmed on abdominal Magnetic Resonance Imaging. Abdominal abscess