If you have no Angina then you probably have developed colaterals and, in my case, I did nothing, but I also have a huge amount of Calcium Phosphate in my LAD that, I think, keeps the plaque anchored down and prevents it from breaking up, forming blood clots - I'll never know, though, until it happens. Good luck.
Part of your heart it is not receiving blood, or at least not in the way it should be .
Consequences depends on position of the obstruction and development or not of collaterals as well as possible irrigation from the posterior arteries.
Worse case consequences are Angina and heart attack. In that case solutions are stents or bypass.
Jesus