AppendicitisAppendectomyPneumoniaAppendixPneumonia, BacterialAbdomen, AcuteIntestinal PerforationPneumonia, ViralPneumonia, PneumococcalAbdominal AbscessAbdominal PainAcute DiseaseFecal ImpactionCryptogenic Organizing PneumoniaPneumonia, PneumocystisCecal DiseasesPneumonia, StaphylococcalRupture, SpontaneousGangrenePneumonia, Ventilator-AssociatedPneumonia, AspirationLaparoscopyDiagnostic ErrorsAppendiceal NeoplasmsCommunity-Acquired InfectionsPneumonia, MycoplasmaMesenteric LymphadenitisRetrospective StudiesDiverticulitisPneumonia, LipidHernia, FemoralTomography, X-Ray ComputedRadiography, AbdominalTorsion AbnormalityCecal NeoplasmsAbscessAnti-Bacterial AgentsLung Diseases, InterstitialLaparotomyProspective StudiesSensitivity and SpecificityTreatment OutcomeLithiasisLength of Stay