Evaluation of FDOPA-PET/MRI in Pediatric Patients With CNS Tumors

"Irinotecan IV over 90 minutes on Days 1, 15, and 29 of each cycle (except Cycle 1, when it will be started on Day 29)~Note: Irinotecan can be removed from the treatment plan at the discretion of the healthcare provider."

Bevacizumab will be given intravenously AFTER the irinotecan infusion is complete on Days 1, 15, and 29 of each cycle. The first dose will be given over 90 minutes, but doses after that may be given over 30-60 minutes.

FDOPA-PET/MRI imaging Baseline (before beginning Cycle 1 treatment) Cycle 1, Day 29 (before receiving your treatment with bevacizumab) and end of treatment or time of relapse