My sister has recently been diagnosed with acquired Chiari as well, due to overdrainage from the combination of an LP and VP shunt for pseudotumor cerebri. She is currently in the hospital after surgery to remove the LP shunt. The VP shunt has been adjusted several times (she has a programmable) and finally seems to be at close to the ideal setting because her headaches are improving. Unfortunately, she still has a CSF leak where the LP shunt was and may need surgery to repair it (hasn't healed yet after almost a week back in the hospital- leak stopped on the outside but MRI still shows internal leaking). Do you have any experience with leaks? My nickname on this forum is PTC_patient_sister if you want to chat- it seems difficult to find people who have both PTC and Chiari