Mid LAD myocardial bridge

Please note the mid part of the vessel getting constricted during systole.  You can see it getting constricted and released, that's because, that segment of the vessel is passing through cardiac muscle. In systole, due to muscle contraction, vessel is getting squeezed.

Contributed by Dr Rakesh Gopal , Apollo hospital Chennai
(Consultant Interventional Cardiologist)
Studied Interventional Cardiology at Sree Chitra Tirunal Institute for Medical Sciences and Technology