AIM:Todescribeanewclassificationmethodofrighthepatectomyaccordingtothedifferentspecialpositionsoftumors.METHODS:Accordingtopositions,91patientswithmalignanthepatictumorintherightliverlobewerepidedintosixgroups:tumorsintherightposteriorlobeand(or)therightcaudatelobecompressingtherightportalhilum(n=14,15.4%),tumorsintherightliverlobecompressingtheinferiorvenacavaand(or)hepaticveins(n=11,12.9%),tumorsinfiltratingdiaphragmaticmuscle(n=7,7.7%),tumorsinthehepatorenalrecess(infiltratingtherightfattyrenalcapsule,transversecolonandrightadrenalgland,n=8,8.8%),tumorsdeeplylocatednearthevertebralbody(n=3,3.3%),tumorsatothersitesintherightliverlobe(thecontrolgroup,n=48,52.75%).Thevaluesofintraoperativebloodloss(IBL),tumor'smaximcross-sectionarea(TMCSA),andtimeofhepatichilumclamping(THHC)andincidenceofpostoperativecomplicationswerecomparedbetweenfivegroupsoftumorandcontrolgroup,respectively.RESULTS:TheTHHCingroups1-4wassignificantlylongerthanthatinthecontrolgroup,theIBLingroups1-4wassignificantlyhigherthanthatinthecontrolgroup,theTMCSAingroups2-4wassignificantlylargerthanthatinthecontrolgroup,andtheratioofIBL/TMCSAingroup1wassignificantlyhigherthanthatinthecontrolgroup.Therewasnosignificantdifferenceintheindexesbetweengroup5andthecontrolgroup.CONCLUSION:ThesiteoftumoristhekeyfactorthatdeterminesIBL.
