A case of therapy-resistant bilateral intermediate uveitis is presented. Vitreous biopsy and lumbar puncture resulted in the diagnosis of high-grade malignant non-Hodgkin's lymphoma (NHL). Because chemotherapy and radiotherapy continue to yield better results in the treatment of NHL and a cure can be reached in a large group of patients with high-grade malignant NHL, early diagnosis is very important. We therefore recommend early vitreous biopsy in persistent, bilateral, granulomatous intermediate uveitis, especially in older patients. Our patient achieved a complete remission (follow-up period at the time of writing, 18 months after the beginning of polychemotherapy and radiotherapy). The chemotherapy modalities are briefly discussed.