ized ▁and ▁out comes ▁can ▁be ▁optimized . ▁ ▁Term in ology ▁ ▁The ▁termin ology ▁used ▁to ▁define , ▁describe , ▁and ▁categor ize ▁v asc ular ▁tum ors ▁and ▁mal form ations ▁has ▁changed ▁over ▁time . ▁ ▁The ▁term ▁hem ang i oma ▁was ▁originally ▁used ▁to ▁describe ▁any ▁v asc ular ▁tum or - like ▁structure , ▁whether ▁it ▁was ▁present ▁at ▁or ▁around ▁birth ▁or ▁appeared ▁later ▁in ▁life . ▁In ▁ 1 9 8 2 , ▁Mul li ken ▁and ▁G low ack i ▁proposed ▁a ▁new ▁classification ▁system ▁for ▁v asc ular ▁anom al ies ▁which ▁has ▁been ▁widely ▁accepted ▁and ▁adopted ▁by ▁the ▁International ▁Society ▁for ▁the ▁Study ▁of ▁V asc ular ▁An om al ies . ▁This ▁classification ▁system ▁was ▁recently ▁updated ▁in ▁ 2 0 1 5 . ▁ ▁The ▁classification ▁of ▁v asc ular ▁anom al ies ▁is ▁now ▁based ▁upon ▁cell ular ▁features , ▁natural ▁history , ▁and ▁clin ical ▁behavior ▁of ▁the ▁les ion . ▁V asc ular ▁anom al ies ▁are ▁divided ▁into ▁v asc ular ▁tum ors / ne op las ms ▁which ▁include ▁infant ile ▁hem ang iom as , ▁and ▁v asc ular ▁mal form ations ▁that ▁include ▁entities ▁with ▁en larg ed ▁or ▁ab normal ▁vessels ▁such ▁as ▁cap ill ary ▁mal form ations ▁( port ▁wine ▁st ains ), ▁ven ous ▁mal form ations , ▁and ▁l ym ph atic ▁mal form ations . ▁In ▁ 2 0 0 0 , ▁GL UT -