7 days postop: Brain MRI. (pentobarbital IV). Neuro exam before discharge. 3-6 months: Brain MRI immediately before or after 2nd surgery, or as outpatient (IV pentobarb or propofol/midazolam—may use N2O/sevo for induction, cannot intubate if outpatient; OR if cardiac MRI at same time, any indicated anesthetic technique). NIRS x 24h after 2nd surgery.