Retinal vascular inflammatory and occlusive changes in infectious and non-infectious uveitis

Purpose Retinal vasculitis and occlusive changes are important signs of posterior uveitis and are possible diagnostic markers for uveitis. However, the frequency of arteritis and phlebitis in various uveitis entities, including infectious uveitis (IU) and non-infectious uveitis (NIU), have not been systematically investigated. Study design Retrospective. Methods We investigated the frequency of retinal vascular inflammatory and occlusive changes in patients with IU and NIU. The study included 283 patients with intermediate, posterior, or pan-uveitis who were diagnosed with IU (presumed tuberculous uveitis, acute retinal necrosis, cytomegalovirus retinitis, human T-cell lymphotropic virus type 1-associated uveitis, toxoplasmic retinitis, syphilitic uveitis, rubella virus-associated uveitis, fungal endophthalmitis, and bacterial endophthalmitis) or NIU (sarcoidosis, Behcet's disease, Vogt-Koyanagi-Harada disease, human leukocyte antigen-B27-associated uveitis, systemic lupus erythematosus retinopathy, psoriatic uveitis, rheumatoid arthritis/collagen disease-associated uveitis, multiple sclerosis-associated uveitis, and sympathetic ophthalmia). All patients underwent fluorescein angiography (FA) and color photography examinations of the fundus. Presence of inflammatory and occlusive changes was determined by FA images. Results Significantly higher positive ratios of phlebitis, vein sheathing, vein occlusion, arteritis, artery sheathing, artery occlusion, and avascular areas were observed in the IU group than in the NIU group (p < 0.05). Notably, the discrepancy between IU and NIU was prominent with regard to retinal arterial changes (arteritis [57.9% vs 11.2%], inflammatory artery sheathing [33.7% vs 0%], and artery occlusion [22.1% vs 3.7%], respectively; p < 0.0001). Conclusion Findings of vasculitis and occlusion, especially in retinal arteries, in FA strongly suggest an infectious origin of active uveitis.