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Rigler's Sign vs Rigler's Triad Rigler's Sign: - Gas on both sides of the bowel wall - indicative of perforation Rigler's Triad - Pneumobilia (A) + small bowel obstruction (B) + ectopic calcified gallstone (C) - Indicative of gallstone ileus Dr. Keith Siau @drkeithsiau #Riglers #Sign #Triad #comparison #diagnosis #surgery