nt re ated ▁or ▁un recogn ized ▁they ▁can ▁be ▁fatal ▁due ▁to ▁dis section ▁or ▁" po pping " ▁of ▁the ▁an eur ys m ▁leading ▁to ▁nearly ▁instant ▁death . ▁Thor ac ic ▁an eur ys ms ▁are ▁less ▁common ▁than ▁an ▁ab dom inal ▁a ort ic ▁an eur ys m . ▁However , ▁a ▁sy ph il it ic ▁an eur ys m ▁is ▁more ▁likely ▁to ▁be ▁a ▁thor ac ic ▁a ort ic ▁an eur ys m ▁than ▁an ▁ab dom inal ▁a ort ic ▁an eur ys m . ▁This ▁condition ▁is ▁commonly ▁treated ▁via ▁a ▁special ized ▁mult id is cipl inary ▁approach ▁with ▁both ▁v asc ular ▁sur ge ons ▁and ▁card iac ▁sur ge ons . ▁ ▁Pres entation ▁ ▁Comp lications ▁ ▁The ▁principal ▁causes ▁of ▁death ▁due ▁to ▁thor ac ic ▁an eur ys mal ▁disease ▁are ▁dis section ▁and ▁ru pt ure . ▁Once ▁ru pt ure ▁occurs , ▁the ▁mort ality ▁rate ▁is ▁ 5 0 – 8 0 %. ▁Most ▁death s ▁in ▁patients ▁with ▁Mar fan ▁synd rome ▁are ▁the ▁result ▁of ▁a ort ic ▁disease . ▁ ▁C aus es ▁There ▁are ▁a ▁number ▁of ▁causes , ▁ ▁A neur ys ms ▁in ▁patients ▁younger ▁than ▁ 4 0 ▁usually ▁involve ▁the ▁asc ending ▁a ort a ▁due ▁to ▁a ▁weak ening ▁of ▁the ▁a ort ic ▁wall ▁associated ▁with ▁connect ive ▁t issue ▁dis orders ▁like ▁the ▁Mar fan ▁and ▁E h ler - Dan