Optical Coherence Tomography Angiography Findings in Susac Syndrome

      A 37-year-old man sought treatment for acute peripheral vision loss. Previously he had a branch retinal artery (BRAO) occlusion in the fellow eye and reported long-standing hearing loss. His examination demonstrated (A) sectoral retinal whitening nasally, with (B, C) widefield fluorescein angiography showing corresponding perfusion delay with leakage suggestive of vasculitic BRAO. D, E, F, G, H, I, Optical coherence tomography angiography (OCTA) showed flow void of superficial and deep capillary plexuses. E, F, H, I, The en face scans showed hyperreflectivity of the inner and middle retinal layers. J, K, L, M, There were no abnormalities in the choriocapillaris or choroid on OCTA. The brain magnetic resonance imaging scan demonstrated subcortical white matter changes that confirmed the diagnosis of Susac syndrome.
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