We report about one case of cholecystoduodenal fistula complicated by antropyloric lithiasic obstruction, which was treated surgically with gastrotomy and extraction of the calculus, in an 82-year-old woman. This case represents an anatomic variant of Bouveret's syndrome, which is classically defined as a duodenal lithiasic obstruction. On the basis of this case, the authors discuss the diagnostic and possibly therapeutic merits of digestive endoscopy and define the main clinical, anatomical and evolutive characteristics of this unfrequent complication of biliary lithiasis.