Hepatic portal venous gas (HPVG) is usually associated with necrotizing enterocolitis or bowel ischemia in infants but it’s a rare finding with hypertrophic pyloric stenosis (HPS). HPVG is generally considered an alarming radiological sign as it is associated with high mortality in all age groups. The most common recognized life threatening conditions leading to portal venous gas include ischemic necrotic bowel, necrotizing enterocolitis, intra-abdominal abscess, inflammatory bowel disease, acute hemorrhagic pancreatitis, gastric ulcer and diabetic ketoacidosis.
Shakil U, Waqar T, Usman N (2014) Infantile Hypertrophic Pyloric Stenosis - A Rare Cause of Hepatoportal Venous Gas . Pediat Therapeut 4: 215.