CystadenocarcinomaCystadenocarcinoma, MucinousCystadenomaCystadenoma, MucinousCystadenocarcinoma, PapillaryAdenocarcinoma, MucinousAppendiceal NeoplasmsCystadenocarcinoma, SerousPseudomyxoma PeritoneiOvarian NeoplasmsCystadenoma, PapillaryPancreatic NeoplasmsMucoceleCystsPyonephrosisMixed Tumor, MesodermalCarcinoma, Pancreatic DuctalBiliary Tract NeoplasmsTumor Markers, BiologicalMucinsParotid NeoplasmsBarium SulfatePeriodic Acid-Schiff ReactionKeratin-7Bile Ducts, IntrahepaticBile Duct NeoplasmsCystadenoma, SerousRetroperitoneal NeoplasmsTomography, X-Ray ComputedCholangiopancreatography, Endoscopic RetrogradePancreatic PseudocystPeritoneal NeoplasmsSalivary Gland NeoplasmsKeratin-20Mucin-2ImmunohistochemistryCarcinoma, PapillaryPancreatectomyNeoplasms, Unknown PrimaryPancreatic DuctsLiver NeoplasmsHydroxy AcidsCarcinoma, EndometrioidPancreaticoduodenectomyRetrospective StudiesTumor BurdenTumor Necrosis Factor-alphaImmunoenzyme Techniques