Patients in this study will receive rituximab by vein over 3 to 8 hours weekly for 6 weeks in a row. ABVD will be injected over 3 hours every other week for a total of 12 treatments. On the cycles where both rituximab and ABVD are given, rituximab will be given on day 1, and ABVD will be given on day 2. Response to therapy will be determined after 3 months and at the end of therapy (6 months). At the end, patients may receive radiation therapy to areas of large masses. All treatments can be given in an outpatient setting.