Fig. 1

Radiography of abdominal cavity and intestine. a Apparently intestinal dilatation and free-air in abdominal cavity in abdominal CT scan. b CT scan showing free-air in the peritoneal cavity again with a small amount of perihepatic and perisplenic effusion. c Abdominal CT displaying subdiaphragmatic free-air again and intestinal dilatation with recurrence of the symptoms. d A translucent crescent or area (free air) below the diaphragm could be observed on upright posteroanterior chest radiography. e CT scan revealing marked distension of the stomach, which was vertical and occupied a low position. f The upright conventional abdominal radiography showing the presence of intestinal dilatation, air-fluid level formation. g Subdiaphragmatic free-air disappeared after gastrointestinal decompression in the upright abdominal radiography