What Does Short Calcified Vessel Shown In Angiography Mean?

my father is 79 years old, in the Anjiography ( 29.12.14) report it is mentioned Left main-: Short calcified vessel.Dista 60% eccentric stenosis with thrombus and-LAD Type-III,Ostial 80% stenosis,diatal 80%,LCx:Non dominant.Procimal to distal 70% long segment stansis,RCA:Dominant vesse Proximal 80% stanosis,mid 80% stenosis.Distal plaquing. Consulting doctor denied for stent and suggested for urgent CABG.Please suggest looking to the age.