 CONSOLIDATION THERAPY: Patients receive the CYM-RM regimen comprising rituximab IV and methotrexate IV over 4 hours on day 0; leucovorin calcium IV or orally every 6 hours for 12 doses on days 1-3; cytarabine IV over 24 hours daily on days 1-5; hydrocortisone IT on days 1 and 6; methotrexate IT on day 1; and cytarabine IT on day 6. 