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168Chapter10CranialwidthvariedbuthadnoclearpatternregardingthesignificantdifferencesbetweenthesurgerygroupsthemselvesandbetweenthesurgerygroupsandreferencesHowever,cranialwidthissignificantsmallerforEACSandOCVRpatientsbeforesurgerycomparedtothereferencesbutthisdifferenceresolvesaftersurgeryforbothgroups ThecraniallengthinbothgroupsremainedlongercomparedtothereferencesThecircumferenceofbothtreatmentgroupsweresignificantlylargerthanthereferencesin theearlierpost-surgeryagegroups The volumedifferencesbetweenthetreatmentgroupsandthereferenceswereminimalFigure 4Growthmapsindicating themeanheadshapedifferences(inmm)betweenEACSandOCVRat24monthsofage(post-surgery)TheEACSheadshapeisbaselinehenceapositivevalueindicatesthattheOCVRheadshapehaslocalizedadditionalvolumeoverthatofEACSandviceversaNotethecolorscaling(05mm/uniquecolor)ThelengthoftheEACSheadshapeisshorterwhilethevertexishigherandthebitemporaldistancelarger