Cystadenoma, MucinousCystadenocarcinoma, MucinousNeoplasms, Cystic, Mucinous, and SerousPancreatic CystCystadenoma, SerousCystadenomaCyst FluidCystadenocarcinomaPancreatic NeoplasmsPancreatic PseudocystAdenocarcinoma, MucinousMesenteric CystCarcinoma, Pancreatic DuctalPancreatectomyCystsPregnancy Complications, NeoplasticMucinsBile Duct NeoplasmsPancreasEndosonographyTumor Markers, BiologicalAdenocarcinoma, PapillaryCystadenocarcinoma, SerousTomography, X-Ray ComputedCarcinoma, PapillaryBiopsy, Fine-NeedlePancreaticoduodenectomyCholangiopancreatography, Endoscopic RetrogradeNeoplasm InvasivenessDNA, NeoplasmNeoplasmsImmunohistochemistryRetrospective StudiesMagnetic Resonance Imaging