Is it possible for someone to be born with a tail?

I was watching That '70s Show and Eric told everyone that his sister, Laurie, was born with a tail.

Is this possible? I mean, just a little stump like?

I seem to recall reading somewhere that a mutation in one gene can cause a person to be born with a tail. Take that with a grain of salt, of course.

Cecil on the subject:

Guin, 15000+ posts and you didn’t think to check Cecil first? Well, everyone has an off day from time to time.