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Fig. 4. —55-year-old man with small stone in common bile duct, acute pancreatitis associated with moderate dilatation of bile ducts, and no gallbladder stone detected by sonography. Heavily T2-weighted single-shot fast spin-echo MR cholangiopancreatography sequence (coronal oblique slice 20 mm thick; TE_eff = 980 msec) shows dilatation of common bile duct (star). Regular lacuna is seen because of 4-mm stone impacted in lower common bile duct (arrow).