Portal venous gas
 Discussion of Portal venous gas
- Ominous sign in the clinical setting of mesenteric ischemia in adults or necrotizing enterocolitis
- Mortality rates associated with portal venous system gas are 29%–43%.
- Other reported causes of portal venous system gas are pancreatitis, abdominal abscess, small bowel obstruction, large bowel obstruction, perforated gastric ulcer or carcinoma, diverticulitis, inflammatory bowel disease, abdominal trauma, ingestion of a caustic agent, enema administration, colonoscopy, gastrostomy tubes, and liver transplantation.
 Imaging Findings for Portal venous gas
- Plain radiographs demonstrate linear at the periphery of the liver.
- On CT scans, air in the portal vein manifests as streaks of air that can reach the capsule at the periphery of the liver.
- Air has a propensity to accumulate in the the left portal vein due to its more ventral location.
- Pneumobilia is a differential consideration but gas with pneumobilia is more centrally located in the liver.
Patient #2: Patient presenting with portal venous gas and aortic dissection
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 References for Portal venous gas
- Carmen Gallego, Maria Velasco, Pilar Marcuello, Daniel Tejedor, Lourdes De Campo, and Alfonsa Friera. Congenital and Acquired Anomalies of the Portal Venous System. RadioGraphics 2002 22: 141-159.