[Recurrence of non-Hodgkin's lymphoma: late recurrences].

563 patients with Stage I and II non-Hodgkin's lymphoma were treated by radiotherapy. 34 recurrences that occurred after 3 years from initial treatment were seen in those patients. 15 (44%) of 34 recurrences occurred after 5 years. 20 patients (59%) had remission by re-treatment, and 13 (38%) survived more than 2 years. 20 (59%) of recurrences were seen on head and neck lesions and superficial lymph nodes.