unusual spine issue

Have a young lady (5yrs old) who had x-rays today of her full spine. Surprisingly, they found that her lower spine sits BELOW her pelvis. I have never seen or heard of anything like it. She has a mild upper spine c curve to the right which is what they were investigating. She has an as yet un-named disorder which causes the right and left halves of her body (bones) to grow at different rates. Again, this is something I have not encountered before. Anyone out there ever seen anything like this??