Adenocarcinoma, MucinousCarcinoma, Pancreatic DuctalNeoplasms, Cystic, Mucinous, and SerousAdenocarcinoma, PapillaryCarcinoma, PapillaryPancreatic NeoplasmsPancreatic CystPancreatectomyCystadenoma, MucinousCystadenoma, SerousCyst FluidCholangiopancreatography, Magnetic ResonancePancreatic JuicePancreaticoduodenectomyCystadenocarcinoma, MucinousAppendiceal NeoplasmsMucin-2EndosonographyIndianaPseudomyxoma PeritoneiPancreatic DuctsNeoplasms, Multiple PrimaryPancreasMucinsCarcinoma in SituTomography, X-Ray ComputedClaudin-4CystadenocarcinomaNeoplasm InvasivenessPrecancerous ConditionsCholangiopancreatography, Endoscopic RetrogradeOsteonectinRetrospective StudiesImmunohistochemistryFixativesTumor Markers, BiologicalAdenomaAppendixAdenocarcinomaCystadenomaTreatment OutcomeDiverticulumNeoplasm StagingMagnetic Resonance ImagingPeritoneal NeoplasmsPrognosisNeoplasmsAppendectomy