One in four babies has an abnormality. Be it minor or complicated. If they had never scanned you or tested you you would have had a happy and healthy pregnancy last time, probably the same this time. Hugs for the stress all any of us want is a healthy baby.
I think Tegam summed it up perfectly.

FWIW I actually have a kidney defect, one of mine doesn't drain as efficiently as the other because of a small defect. Thing is, it was only ever picked up by chance when I was having other investigative tests done for something else. It's never given me a problem. But I do wonder if they had of done ultrasounds when I was born if it would've been something that would've caused my mother a whole heap of stress...

Try not to worry too much hun, chances are it will turn out to be nothing