Pattern and distribution of neovascularization in proliferative diabetic retinopathy on fundus fluorescein angiography: A growing paradigm

Background The objective of this study was to evaluate pattern and distribution of neovascularization of optic disc (NVD) and elsewhere (NVE) in proliferative diabetic retinopathy (PDR). Methods A cross-sectional study was conducted among freshly detected cases of PDR. Fundus fluorescein angiographic images of 61 eyes were assessed. Parameters studied for NVD were their number and location and for NVE were their number, location, type of leak, and distance from center of optic disc. Results Of 61 eyes, 29 eyes (47.5%) had NVD with a total of 49 leaks. Of these 49 NVD leaks, the maximum was concentrated in the superotemporal quadrant with 21 leaks (42.9%; 95%CI 28.8–57.8%). Of 61 eyes, 50 eyes (82%) had NVE with 97 leaks. Of 97 NVE leaks, 41 were found in the superotemporal quadrant (42.3%; 95%CI 32.3–52.7%). Maximum NVE was found within the circle of radius 3–6 mm centered on optic disc (p value = 0.001) with no leaks in central macula. Of 29 eyes with NVD, only 7 eyes had >1/3 area of disc involvement. Also, of 18 eyes with concurrent NVD and NVE, only 2 eyes had >1/3 area of disc involvement which is a high-risk characteristic of PDR. Conclusion Neovascular lesions have a predilection for superotemporal part for both NVD and NVE. NVE leaks were almost double the number of NVD leaks. Maximum NVE leaks were found at posterior pole with no central macular involvement. This study provides comprehensive data and further adds to knowledge of neovascularization for early diagnosis and management of PDR.