Hi, my fiance has had open heart surgery in October of 2016 and since he s been home, he s had alot of trouble walking with his left leg where the took the vein out for the bypass also. Also right near/on the sternum part of his stomach, he has this weird sensation and pain... He describes it like something is attached or growing there, it feels likes he says. We ve been to the ER for it too. They have taken x Ray s and stuff but said it s muscular related. I just actually felt it tonight and it feels hard and small, about a quarter size. It feels weird, to me... Anyways. Thank you for your time and hope to hear from you soon.