OPTICAL COHERENCE TOMOGRAPHY ANGIOGRAPHY of CHORIORETINAL LESIONS DUE to IDIOPATHIC MULTIFOCAL CHOROIDITIS

Purpose: To evaluate the spectrum of macular chorioretinal lesions occurring in idiopathic multifocal choroiditis using optical coherence tomography angiography (OCTA) to evaluate those showing neovascular flow. Methods: This was a descriptive, retrospective study of 18 eyes of 14 patients with multifocal choroiditis. Macular lesions were characterized as subretinal pigment epithelium, subretinal, or mixed and evaluated during active and presumed inactive states of multifocal choroiditis. Correlations between structural optical coherence tomography and OCTA were performed. In select cases, correlations between OCTA, fluorescein angiography, and fundus autofluorescence were evaluated. In 5 eyes, quantitative measurements of neovascular lesions were compared at baseline and following intravitreal anti-vascular endothelial growth factor therapy. Results: Mean patient age was 48 years (SD: 13.8; 86% women). Optical coherence tomography angiography flow signatures consistent with neovascularization were identified in 83% of eyes, including in 0% of subretinal pigment epithelium, 91% of subretinal, and 100% of mixed lesions. Lesions that did not demonstrate definitive signs of fluorescein angiography leakage were frequently found to have neovascularization using OCTA. There was no change in quantitative measurements of neovascular lesions after anti-vascular endothelial growth factor therapy (all tested variables P > 0.05). Conclusion: Optical coherence tomography angiography may be a useful imaging modality for understanding the pathophysiology of multifocal choroiditis and monitoring its clinical course.