Portal venous gas in hypertrophic pyloric stenosis.

Portal venous gas associated with hypertrophic pyloric stenosis is a rare finding. We describe an atypical radiologic finding discovered on abdominal ultrasound and computed tomographic scan in an infant with hypertrophic pyloric stenosis. Portal venous gas in the setting of hypertrophic pyloric stenosis constitutes a benign incidental finding for which surgical treatment should not be postponed.