Rolling in the Deep: Imaging Findings and Diagnostic Pearls in Gallstone Ileus

Figure 2

Rigler’s triad in a supine abdominal radiograph. Note is made of the association of pneumobilia (arrowheads), a peripherally calcified stone (arrows) superimposed to the lumbar spine, and evident gastric overdistension; findings are consistent with gastric outlet obstruction due to a migrated large gallstone.