Shunt Surgery to Drain Syrinx

Hi! My 3 year old daughter has 2 syrinx. Last October she had the decompression surgery. Been doing pretty good ever since. She has a MRI at beginning of Sept. I was wondering if anybody has a child that has had the surgery for the shunt to drain the syrinx? About 5 months ago it hadn't drained at all. So unless this MRI comes out with some movement of them then we may be facing this decision of this shunt surgery. Any info on this is appreciated! Thanks!!