AppendicitisAppendectomyAppendixAbdomen, AcuteIntestinal PerforationAbdominal AbscessAbdominal PainFecal ImpactionAcute DiseaseCecal DiseasesRupture, SpontaneousGangreneLaparoscopyDiagnostic ErrorsAppendiceal NeoplasmsMesenteric LymphadenitisDiverticulitisRetrospective StudiesHernia, FemoralRadiography, AbdominalTomography, X-Ray ComputedTorsion AbnormalityCecal NeoplasmsAbscessLaparotomyTreatment OutcomeProspective StudiesLithiasisSensitivity and Specificity