Journal of Research in Medical Sciences1735-199511520061226Gallstone ileus of duodenum with huge duodenal stone329331ENMohammadEhsanDepartment of Radiology, Kerman University of Medical Sciences. mrza1234567@yahoo.comMohammad RezaAhangaran2006122620061226Gastrointestinal obstruction by a gallstone is an uncommon but important complication of biliary stone disease which mostly affects the elderly. The classic triad of radiological features includes pneumobilia, ectopic gallstone and evidence of intestinal obstruction. Terminal ileum is the most common site of obstruction, followed by jejunum and gastric outlet. We present a case of duodenal gallstone ileus of a large, fluid-density mixed biliary stone with a peripheral rim of hyperdensity (very fine calcification) in CT scan. KEY WORDS: Gallstone ileus, duodenum, intestinal obstruction.