My daughter was diagnosed with a Chiari Malformation with a syrinx. She had a posterior fossa craniectomy to make room for the Chiari. The hope was that with time, the syrinx would reduce, but it has not (it has been 2 years). It is not getting worse, but it is fairly severe and is present in almost the entire length of the spinal cord. Since she is asymptomatic, our neurosurgeon is NOT recommending a stint be used to drain this and she has not had this done. My son and I are both certified scuba divers, and my daughter very much wants to do this as well, but I'm concerned about the affects of pressure on the syrinx. She is presently 11. Any thoughts?