RESUMEN
PURPOSE: The aim of this study was to evaluate retinal microvascular abnormalities following plaque radiotherapy of choroidal melanoma (CM) using wide-field swept-source optical coherence tomography angiography (OCTA). DESIGN: Single-centre retrospective review. METHODS: Retrospective case series of 105 CM patients treated with I-125 plaque radiotherapy and imaged with wide-field (15â×â9 mm) SS-OCTA from March 2018 to August 2018 at the Ocular Oncology Service, Wills Eye Hospital (Philadelphia, PA). RESULTS: At mean follow-up of 49 months (range 4-297) after plaque radiotherapy, there were 52 eyes (50%) with clinically evident radiation retinopathy (CERR) and 53 eyes (50%) without CERR. Comparison (CERR vs controls) revealed foveal avascular zone enlargement (1.7 vs 0.23 mm, Pâ=â0.03) and reduction of capillary vascular density (CVD) in the superficial and deep plexus in the total wide-field (43% vs 47%, Pâ<â0.001, and 46% vs 48%, Pâ=â0.001, respectively), peripapillary region (66% vs 77%, Pâ<â0.001, and 66% vs 72%, Pâ=â0.001, respectively), and papillomacular bundle (60% vs 68%, Pâ<â0.001, and 61% vs 64%, Pâ=â0.03, respectively). Comparison (no CERR vs controls) revealed nonsignificant foveal avascular zone enlargement (1.20 vs 0.23 mm, Pâ=â0.16) and reduction of CVD in the superficial plexus (46% vs 47%, Pâ=â0.008), and not the deep plexus (48% vs 48%, Pâ=â0.42) of the total wide-field. Comparison of irradiated eyes (CERR vs no CERR) showed reduction of CVD in the superficial and deep plexus of the total wide-field (43% vs 46%, Pâ<â0.006, and 46% vs 48% Pâ<â0.02, respectively), peripapillary region (66% vs 74%, Pâ<â0.001, and 66% vs 72% Pâ<â0.01, respectively), and superficial plexus in the papillomacular bundle (60% vs 65%, Pâ=â0.03). CONCLUSIONS: Following plaque radiotherapy for choroidal melanoma, wide-field swept-source optical coherence tomography angiography demonstrates retinal microvascular abnormalities in the CVD in eyes with and without CERR. These findings are important in early detection and monitoring of radiation retinopathy.