Pneumatosis portalis

The radiologic finding of gas within the portal venous system and its intrahepatic branches. Possible causes are bowel ischemia, necrotizing enterocolitis, infection (intra-abdominal abscess, diverticulitis, appendicitis), bowel inflammation (ulcerative colitis, Crohn's disease), intestinal obstruction, iatrogenic (endoscopy, high-pressure mechanical ventilation) or trauma.