1. Date of download: 6/23/2016 Copyright © 2016 American Medical Association. All rights reserved. From: Hepatic Portal Venous Gas: The ABCs of Management Arch Surg. 2009;144(6):575-581. doi:10.1001/archsurg.2009.88 A frontal plain abdominal radiograph obtained in the supine position demonstrates distended loops of bowel and extensive hepatic portal venous gas (arrows). This finding was missed on the initial read of the plain radiograph. Figure Legend:

2. Date of download: 6/23/2016 Copyright © 2016 American Medical Association. All rights reserved. From: Hepatic Portal Venous Gas: The ABCs of Management Arch Surg. 2009;144(6):575-581. doi:10.1001/archsurg.2009.88 Axial (A) and coronal (B) views of contrast-enhanced computed tomographic images of the liver with extensive hepatic portal venous gas (arrows). Hepatic portal venous gas in a patient with peritonitis is an ominous finding with a potentially fatal outcome that warrants immediate emergency surgery. Figure Legend:

3. Date of download: 6/23/2016 Copyright © 2016 American Medical Association. All rights reserved. From: Hepatic Portal Venous Gas: The ABCs of Management Arch Surg. 2009;144(6):575-581. doi:10.1001/archsurg.2009.88 Axial (A) and sagittal (B) computed tomographic images from a case with benign portal venous gas in the left lobe of the liver (arrows) with emphysematous gastritis. Under watchful waiting, the patient did well and recovered completely without any untoward sequelae. Figure Legend:

4. Date of download: 6/23/2016 Copyright © 2016 American Medical Association. All rights reserved. From: Hepatic Portal Venous Gas: The ABCs of Management Arch Surg. 2009;144(6):575-581. doi:10.1001/archsurg.2009.88 Proposed clinical algorithm for management of patients in whom hepatic portal venous gas (HPVG) is found by plain abdominal radiograph or abdominal computed tomographic (CT) scan. IBD indicates inflammatory bowel disease; PUD, peptic ulcer disease. Figure Legend: