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Fig. 1. —Side branch intraductal papillary mucinous neoplasm. Drawing shows abnormal cells in uncinate side branches that produce large enough quantity of mucus (yellow) to distend side branch system. Mucus can spill over to enlarge adjacent main pancreatic duct. Note that papillary orifice gapes with extruding mucus. Abnormal cells that are not visible may be hyperplastic lining (blue). Subtle elevated area or polypoid projection (purple) can occasionally be seen separate from mobile mucus.