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Follow-up of retinoblastoma using RetCam fluorescein angiography and correlation with clinical findings.

PURPOSE: To report RetCam fluorescein angiographic (FA) changes and correlation with clinical findings in the follow-up of retinoblastoma (RB) after frontline intravenous chemotherapy and other treatments.

METHODS: Patients having RB who underwent post-treatment RetCam fundus photography and FA under general anesthesia between February 2020 and February 2022 were retrospectively analyzed.

RESULTS: 78 eyes of 70 patients with RB were included. In 55 (70.5%) eyes with type 1, 2 or 3 regression patterns, the main tumor started to show hyperfluorescence in arterial phase in 24 eyes (43.6%), in early venous phase in 24 (43.6%) eyes, and in late venous phase in 7 (12.7%) eyes. Of thirty-six (46.2%) eyes with chorioretinal scars developing after focal treatments (cryotherapy and transpupillary thermotherapy), window defects and visible choroidal vessels were found in all eyes, scleral staining in 10 (27.8%), and gliosis on scar tissue in 8 (22.2%). Vitreous seeds showed hyperfluorescence if they were calcified (6 eyes, 7.7%) and hypofluorescence if non-calcified (11 eyes, 14.1%). Retrohyaloid seeds (11 eyes, 14.1%) were hypo/isofluorescent while subretinal seeds (6 eyes, 7.7%) were hyperfluorescent. Leakage from peripheral retinal vessels was detected in 14 (17.9%) eyes and non-perfusion in 6 (7.7%) eyes.

CONCLUSION: RetCam wide-angle FA is useful to evaluate the tumor and associated vascular and retinal changes after treatment in RB. Regressed tumors demonstrate later fluorescein uptake in venous phases. Fluorescein angiographic changes in chorioretinal scars include window defects, visibility of choroidal vessels, scleral staining, and leakage from vessels. Retinal vascular leakage and peripheral non-perfusion can be seen in eyes with regressed stable tumors.

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