Crack just beneath the lever. As you can see that my dura Ace shifter is cracked but but interesting part is that it works perfectly fine but the problem which I face while sprinting is the play which is in the right shifter. It was cracked when I was crashed during a mass start.! People please I would really like to know you opinion. Any kind of glue or paste which I could use to get it back together.
Due to the critical job of your brakes in helping you race safely, the wiser action is to replace your equipment rather than try to fix this type of break. The shifting and brake system may work now but the system is compromised and can fail at any time regardless of how you patch it up. It's hard to swallow, for sure, but you are putting yourself and those you are racing/riding with at risk by continuing to use broken equipment.
Depending on the age of your shifters, Shimano equipment can be mixed and matched so if the price of replacement at the highest level is too much you can look into replacing with Ultegra or 105 without noticing a great dip in performance.