Colon, SigmoidSigmoid DiseasesSigmoid NeoplasmsVeinsIntestinal VolvulusDiverticulitis, ColonicSaphenous VeinPortal VeinVaricose VeinsFemoral VeinJugular VeinsPulmonary VeinsDiverticulum, ColonCranial SinusesColostomyCerebral VeinsMesenteric VeinsIntestinal PerforationRenal VeinsUmbilical VeinsIliac VeinIntestinal ObstructionColectomyMesocolonHepatic VeinsColonic DiseasesPopliteal VeinColonoscopyRectumSubclavian VeinSplenic VeinRetinal VeinIntestinal FistulaColonAzygos VeinBrachiocephalic VeinsSinus Thrombosis, IntracranialAxillary VeinRetinal Vein Occlusion46, XX Disorders of Sex DevelopmentLaparoscopyPhlebographyTomography, X-Ray ComputedSubcutaneous EmphysemaSigmoidoscopyDiverticulitisAnastomosis, SurgicalColon, DescendingCecal NeoplasmsTreatment OutcomeMesenteric CystRadiography, AbdominalVenous ThrombosisRectal NeoplasmsSurgical StaplingDiverticulumBarium SulfateIntestine, LargeColonic Diseases, FunctionalMegacolonGangreneTransverse SinusesProlapseConstipationColonic NeoplasmsGastrointestinal MotilityVenous InsufficiencyEnemaTime FactorsThighColonic PolypsMastoidSurgically-Created StructuresMediastinal EmphysemaPostoperative ComplicationsIntestinal PolypsColitis, IschemicFatal OutcomeRetrospective StudiesAdenocarcinomaCystoscopesCentral Nervous System Vascular MalformationsRectal DiseasesIntestinal MucosaDigestive System Surgical ProceduresVena Cava, InferiorGraft Occlusion, VascularEndoscopyUltrasonography, Doppler, DuplexBrachytherapyPneumoperitoneumColonoscopesGastrointestinal HemorrhageUrinary Bladder FistulaDura MaterForeign-Body MigrationAbdomen, AcuteAbdominal PainNeurokinin AMesenteric Artery, Inferior