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Rigler's triad on abdominal CT scan. (A) pneumobilia (white arrow); (B) ectopic gallstone within duodenum (white arrow) and dilated, fluid-filled stomach due to duodenal obstruction (black arrow).
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Rigler's triad was detected on abdominal CT scan including duodenal obstruction with dilated stomach, ectopic gallstone within duodenum indicating cholecystoduodenal fistula, pneumobilia (Figure 1).
The gallstone causes cholecystoduodenal fistula.
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Figure 2 describes stone after being extracted.