A gasless abdomen refers to a paucity of gas on abdominal radiography, and the specific cause can usually be identified when the patient's history is known. Common causes include:
proximal obstruction: gastric outlet obstruction, esophageal atresia
large abdominal mass - due to displacement
post surgery following pancolectomy, esophagogastrectomy, gastrectomy, and low anterior resection
acute gastrointestinal graft versus host disease 2
a paucity of small bowel gas may be a normal finding in some adults