▁of ▁motor ▁function ▁on ▁the ▁same ▁side ▁of ▁the ▁body ▁as ▁the ▁h erni ation ▁which ▁caused ▁the ▁K ern oh an ' s ▁not ch ▁on ▁the ▁control ater al ▁side . ▁ ▁C aus es ▁The ▁K ern oh an ' s ▁not ch ▁is ▁a ▁secondary ▁phenomen on ▁that ▁results ▁from ▁a ▁major ▁primary ▁injury . ▁Non - t um oral , ▁non - tra um atic , ▁int rac ran ial ▁ha emor rh age ▁rarely ▁causes ▁this ▁phenomen on . ▁ ▁A ▁wide ▁range ▁of ▁serious ▁inj uries ▁can ▁cause ▁an ▁increase ▁in ▁int rac ran ial ▁pressure ▁to ▁trigger ▁the ▁formation ▁of ▁a ▁K ern oh an ' s ▁not ch . ▁In ▁general , ▁this ▁phenomen on ▁occurs ▁in ▁patients ▁with ▁advanced ▁brain ▁tum or ▁or ▁severe ▁head ▁injury . ▁In ▁the ▁case ▁of ▁severe ▁head ▁injury , ▁a ▁cl ot ▁can ▁occur ▁over ▁the ▁surface ▁of ▁the ▁brain ▁and ▁can ▁often ▁cause ▁shift ▁of ▁the ▁middle ▁part ▁of ▁the ▁brain ▁against ▁the ▁tent or ium , ▁which ▁creates ▁the ▁K ern oh an ' s ▁not ch . ▁Chron ic ▁sub d ural ▁h emat omas ▁have ▁been ▁known ▁to ▁be ▁a ▁familiar ▁cause ▁of ▁K ern oh an ' s ▁not ch . ▁ ▁MR Is ▁have ▁shown ▁evidence ▁of ▁K ern oh an ' s ▁not ch ▁from ▁patients ▁with ▁tra um atic ▁head ▁injury ▁that ▁are ▁related ▁to ▁ac ute ▁space - occup ying ▁les ions ▁such ▁as ▁sub d ural ▁h