My boy has one and he got an ultrasound on it and now he needs an MRI because the untrasound was inconclusive. The doctor couldn't see how far down the dimple goes so I'm hoping the MRI will give us more information. I hate that we don't know if there is anything wrong with his spinal cord. His MRI is a month away. He has good movement in his legs. He is always kicking them and when I hold him he will stand. Everything seems normal. I hope it's just a dimple and nothing more.