My rib cage is indented? What Is this called?!

In the middle of my chest my ribcage is like pushed in!. Like if you stuck your finger in playdoh and made an indent!.

I have had this since birth and the doctor told my mom its normal!.
My grandma has one too and so does this guy I know!. So its rare but not that rare!.

When I was little it made it look like I had boobs already!. (Just trying to give you a picture)

I was just wondering if anyone knows what this is called!? The medical term I mean!. I was googling it and couldn't find anything about it!.Www@Answer-Health@Com

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