EndosonographyUltrasonographyGastroscopyCholangiopancreatography, Magnetic ResonanceDigestive System DiseasesCholangiopancreatography, Endoscopic RetrogradePancreatic NeoplasmsBiopsy, Fine-NeedleEndoscopyCholedocholithiasisStomach NeoplasmsBiliary Tract DiseasesDigestive System NeoplasmsDuodenal DiseasesPancreatitisPolypsPancreatitis, ChronicPreoperative CareTomography, X-Ray ComputedEndoscopy, GastrointestinalPancreatic DiseasesAmpulla of VaterPancreasAdenoma, Islet CellGastrointestinal NeoplasmsSensitivity and SpecificityNeoplasms, Cystic, Mucinous, and SerousUltrasonography, Doppler, ColorPancreatic CystNeoplasm StagingCommon Bile Duct NeoplasmsEsophageal NeoplasmsNeuroendocrine TumorsUltrasonography, DopplerProspective StudiesInsulinomaLeiomyomaAdenocarcinomaRetrospective StudiesAngiographyCarcinoma, Pancreatic DuctalPancreatic DuctsUltrasonography, PrenatalLymphatic MetastasisPredictive Value of TestsPronaseLymphoma, B-Cell, Marginal ZoneReproducibility of ResultsMagnetic Resonance ImagingTreatment OutcomeBiopsyUltrasonography, Doppler, DuplexGastric MucosaFollow-Up StudiesNeoplasm InvasivenessUltrasonography, Doppler, PulsedUltrasonography, MammaryUltrasonography, InterventionalUltrasonography, Doppler, TranscranialSulfur HexafluorideContrast MediaPregnancyUrographyBlood Flow VelocityFetal DiseasesScrotumImaging, Three-DimensionalCysts