I had surgery on Monday. There's a piece of cartilage that hangs down from your sternum, called the Xiphoid Process. Well, I had some scar tissue there froma previous operation & it was attached to the Xiphoid thing. The scar tissue calcified for about 4" down the center of my abs. It also protruded, so whenever I layed on my stomach or exerted ie. Bench Press, It caused pain or shortnesss of breath. I had it trimmed down.