During the study, blood samples (about 1 tablespoon each) for routine tests will be repeated every week during Induction and then every 2 weeks during the Maintenance period. The Gd-MRI of the brain and spine will be repeated at Week 6 and 12 and then every 8 weeks. Within 72 hours of each liposomal cytarabine dosing, vital signs and a physical and neurological exam will be done. CSF will be removed from the Ommaya Reservoir every 2 weeks and through lumbar puncture every 6 weeks during Induction and from the Ommaya Reservoir every 4 weeks and through lumbar puncture every 8 weeks during the Maintenance period to look for cancer cells in the fluid.