Fig. 1

Plain abdominal radiographic and abdominal computed tomography (CT) images of case 1. a Plain abdominal radiograph. Small radiolucent clusters suggesting intramural air particles were observed in the ascending colon (white arrows), and radiolucent streaks were observed along the wall of the transverse colon (black arrows). b Abdominal CT under a wide window setting showed intramural gas in the ascending colon (white arrow) and transverse colon (black arrow). c Intramural colonic gases were undetectable on CT after conservative therapy for 7 days