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Fig. 4. —65-year-old man with malignant intraductal papillary mucinous tumor. Helical CT scan shows unilocular cystic lesion (arrowhead) in pancreatic head. Communication between dilated main pancreatic duct (arrow) and cystic lesion is equivocal. It is difficult to differentiate intraductal papillary mucinous tumor from other cystic diseases.