Whether they are "normal" is an interesting philosophical question. There are lots of things that are unusual or rare but which we still think are "normal varia

Whether they are "normal" is an interesting philosophical question. There are lots of things that are unusual or rare but which we still think are "normal variants" - red hair, left-handedness, coronary artery location, the location of the appendix. My rule of thumb is that it's not a medical problem unless it causes a problem for you.