Quoting hαmmers♣inc.:" <blockquote><b>Quoting Krista Alyward:</b>" I had a friend with pigeon chest in school, ... [snip!] ... to correlations the two until now.. especially because his breathing is really bad when he has the smallest amount of activity"
It just looked like a bump in the middle of her chest, she sometimes joked that she had 3 boobs? I didn't know a lot about it, it also may have been less noticeable as she had breasts. There are probably also varying degrees to which you can have it as well. I think hers was fairly minor, she could push on the bone and her rib cage would bulge out the sides, it wasn't painful, and she was fairly active and didn't have any breathing issues.