RectumRectal NeoplasmsRectal DiseasesAnal CanalProctoscopySigmoid NeoplasmsColonColon, SigmoidIntestinal PolypsMegacolonProctitisRectal ProlapseColostomyAdministration, RectalColonic NeoplasmsColonoscopyColorectal NeoplasmsSigmoidoscopyDefecationDigestive System Surgical ProceduresCecal NeoplasmsIntestinal MucosaRadiotherapy Planning, Computer-AssistedColectomyAdenocarcinomaIntestine, LargeSurgical StaplersAdenoma, VillousEnemaConstipationColitis, UlcerativeAnus, ImperforatePerineumGastrointestinal HemorrhageDigestive System NeoplasmsBrachytherapyRadiotherapy DosageColonic DiseasesOrgans at RiskAdenomaColon, TransversePelvisRectovaginal FistulaIleostomyGastrointestinal NeoplasmsColon, DescendingGastrointestinal MotilityAnastomosis, SurgicalPolyphloretin PhosphateFecal IncontinencePolypsVaginaNeoplasms, Multiple PrimaryRadiotherapy, Intensity-ModulatedDigestive SystemColonic PolypsUrinary BladderCecumIleumAnus DiseasesProctocolectomy, RestorativeHemorrhoidsRadiation InjuriesOrgan Sparing TreatmentsUlcerHirschsprung DiseaseSuppositoriesGastrointestinal TransitIntestinal PerforationRadiotherapy, Conformal