Purpose: To assess the levels of retinal and choroidal involvement in initial-onset birdshot retinochoroiditis (BRC) and Vogt-Koyanagi-Harada (VKH) disease, two stromal choroiditis entities.
Methods: This retrospective study included patients diagnosed with BRC and VKH, seen during initial-onset disease at the Centre for Ophthalmic Specialized Care, Lausanne, Switzerland. Angiographic signs were quantified, using an established dual fluorescein angiography (FA) and indocyanine green angiography (ICGA) scoring system for uveitis, and the FA/ICGA score ratios were compared between diseases.
Results: Among 1793 patients with uveitis seen from 1995 to 2015, 7 newly diagnosed BRC patients and 4 patients with newly diagnosed VKH disease had sufficient data for study inclusion. Patients with BRC and VKH at initial onset had mean FA angiographic scores of 16.91 ± 3.42 and 4.06 ± 1.87; mean ICGA angiographic scores of 21.34 ± 3.49 and 25.75 ± 3.88; and mean FA/ICGA ratios of 0.79 ± 0.21 and 0.16 ± 0.09, respectively.
Conclusion: This study showed the differential involvements of the retina and choroid in BRC and VKH. The choroid was preponderantly involved in both diseases; thus, ICGA is essential for disease assessment and follow-up. However, these diseases also differed substantially. The origin of inflammation was primarily in the choroid in VKH and in both the choroid and retina in BRC. We recommend dual FA and ICGA for evaluating posterior uveitis, when choroiditis is suspected.
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