▁blood ▁was ▁asp ir ated , ▁nor ▁was ▁it ▁from ▁a ▁second ▁right - s ided ▁dr illing ▁hole . ▁A ▁right - s ided ▁c ran iot omy ▁was ▁then ▁done , ▁which ▁did ▁not ▁show ▁any ▁signs ▁of ▁a ▁sub d ural ▁blood ▁collection ▁and ▁the ▁operation ▁was ▁ended ... a ▁post oper ative ▁CT ▁scan ▁the ▁next ▁day ▁showed ▁a ▁sub d ural ▁ha emat oma ▁on ▁the ▁left ▁side ▁and ▁the ▁signs ▁of ▁c ran iot omy ▁on ▁the ▁right ... Re const ruction ▁of ▁the ▁events ▁led ▁to ▁the ▁conclus ions ▁that ▁the ▁false ▁local izing ▁signs ▁were ▁caused ▁by ▁a ▁K ern oh an ▁not ch ... the ▁left - right ▁marks ▁on ▁the ▁screen ▁had ▁initially ▁been ▁correct ▁but ▁were ▁wrong ly ▁switched ▁to ▁fit ▁the ▁patients ' ▁clin ical ▁sympt oms . ▁This ▁sad , ▁but ▁unique , ▁example ▁of ▁mis di agn osis ▁has ▁prompt ed ▁us ▁to ▁re - evalu ate ▁the ▁index ▁settings ▁before ▁exam ination ▁of ▁each ▁new ▁patient ." ▁ ▁Ru pt ured ▁oc cip ital ▁ar ter i oven ous ▁mal formation ▁K ern oh an ' s ▁not ch ▁phenomen on ▁associated ▁with ▁a ▁ru pt ured ▁ar ter i oven ous ▁mal formation ▁( AV M ) ▁is ▁rare , ▁but ▁not ▁unknown . ▁This ▁was ▁account ed ▁for ▁in ▁a ▁case ▁study ▁described ▁by ▁F uj im oto ▁at ▁the ▁T su k uba ▁Memorial ▁Hospital ▁in ▁I bar aki , ▁Japan : ▁" The ▁patient