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Schematic representation of periampullary duodenal diverticulum. (a) Principal bile duct normally between 4 and 8 mm in maximum diameter. (b) When a periampullary duodenal diverticulum is present, its extrinsic compression could enlarge periampullary duodenal diverticulum till obstructive jaundice. (PBD = Principal bile duct; PAD = Periampullary duodenal diverticulum; d = duodenum).
