In the remaining patient, in whom no biopsy was performed, the diagnosis of ocular sarcoidosis was supported by an ophthalmologic examination indicating posterior uveitis, chest X-ray and CT scans showing bilateral hilar lymphadenopathy, parenchymal nodules and ground glass opacities, and BAL fluid with CD4 lymphocytosis of 18% and a CD4/CD8 ratio of 4:1. The gene discussed is CD4; the disease is ocular sarcoidosis.