AppendicitisAppendectomyAppendixTomography, X-Ray ComputedAbdomen, AcuteIntestinal PerforationAbdominal PainAbdominal AbscessFecal ImpactionTomographyAcute DiseasePositron-Emission TomographyCecal DiseasesRupture, SpontaneousTomography, Optical CoherenceGangreneTomography, Emission-ComputedTomography, Spiral ComputedLaparoscopyDiagnostic ErrorsAppendiceal NeoplasmsTomography, OpticalRadiography, AbdominalMesenteric LymphadenitisMultidetector Computed TomographyRetrospective StudiesDiverticulitisTomography, Emission-Computed, Single-PhotonCone-Beam Computed TomographyElectron Microscope TomographyHernia, FemoralSensitivity and SpecificityTorsion AbnormalityAbscessCecal NeoplasmsTomography, X-RayLaparotomyFluorodeoxyglucose F18Unnecessary ProceduresPredictive Value of TestsLithiasisTreatment OutcomeProspective StudiesTomography Scanners, X-Ray ComputedMeckel Diverticulum