XP from Feb 2012: Extra placental lobe?

Ya Never Know

I had an appointment with my OB today and he said that my placenta has an extra lobe on it. He said its nothing to worry about but that I need to make sure that the doctors/nurses know about it when I deliver because they need to make sure that both parts of the placenta are fully removed. I'm not worried about it, because my doc certainly wasn't, but just wondering if anyone else has this or has ever heard of it. Kind of weird!