Cystadenoma, MucinousCystadenocarcinomaAdenocarcinoma, MucinousCarcinoma, Pancreatic DuctalCystadenocarcinoma, MucinousPancreatic NeoplasmsCystadenoma, PapillaryCholangiopancreatography, Endoscopic RetrogradePancreatic DuctsCarcinoma, PapillaryCystadenomaCystadenocarcinoma, PapillaryAppendiceal NeoplasmsCystadenocarcinoma, SerousPseudomyxoma PeritoneiPapilloma, IntraductalOvarian NeoplasmsMucoceleCystsPyonephrosisMixed Tumor, MesodermalBile Duct NeoplasmsMucinsTumor Markers, BiologicalCystadenoma, SerousBiliary Tract NeoplasmsCarcinoma, Intraductal, NoninfiltratingBile Ducts, IntrahepaticAdenocarcinoma, PapillaryParotid NeoplasmsPancreatectomyBarium SulfateTomography, X-Ray ComputedPeriodic Acid-Schiff ReactionKeratin-7Mucin-2ImmunohistochemistryRetroperitoneal NeoplasmsPancreatic PseudocystPancreaticoduodenectomyPeritoneal NeoplasmsNeoplasms, Cystic, Mucinous, and SerousSalivary Gland NeoplasmsKeratin-20Retrospective StudiesLiver Neoplasms