[Progressive outer retinal necrosis in a patient with malignant lymphoma].

A 29-year-old man with diffuse large B-cell lymphoma treated by radiotherapy for his relapsed lesion followed by 4 doses of weekly rituximab was admitted to our hospital with interstitial pneumonia. After steroid pulse therapy, he had contraction of the left visual field. He was diagnosed as having progressive outer retinal necrosis due to a varicella-zoster virus that was detected from the left vitreous sample. Systemic antiviral treatment failed to prevent rapid development of whole layer necrosis of the left retina. Vitrectomy with silicone oil tamponade saved his final visual acuity. This unusual event might be related to rituximab causing deterioration of humoral immunity.