A patient who developed primary brain lymphoma 6 years following whole brain irradiation due to a low-grade glioma is described. The patient had no evidence of congenital or acquired immunodeficiency state and achieved a good and prompt response to aggressive chemotherapy, including high-dose methotrexate. The previous radiation therapy is implicated in the etiology of the lymphoma because of the geometric coincidence, the relatively long latency period and the different histology. A brief review of current literature is reported.
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