Bilateral blindness after uneventful brolucizumab injection for macular degeneration

BACKGROUND: We report a very severe case of bilateral panuveitis and ischemic vasculitis with possible perineural inflammation, which followed bilateral intravitreal brolucizumab administration in a patient with neovascular age-related macular degeneration (nAMD). CASE PRESENTATION: On December 11, 2020, a 81-year-old woman presented with severe bilateral loss of vision. Eight days earlier, she had received uneventful bilateral injection of brolucizumab, a novel anti-vascular endothelial growth factor (VEGF) single-chain variable region (scFv) recombinant protein drug, for treatment of neovascular age-related macular degeneration (nAMD). Slit-lamp examination revealed signs of a bilateral panocular vasculitis with ischemia. Scanning laser ophthalmoscopy of her left eye revealed marked vascular sheathing. T1 fat-saturated post-contrast images of the orbit revealed a higher-than-normal signal of the choroid, with localized choroidal detachment. Additionally, pathologic enhancement was visible around the optic nerve in the orbit, which was interpreted as vasculitis. Due to the severe bilateral panuveitis with vasculitis, an additional vitreous tap was obtained, which revealed elevated levels of interleukin six and interleukin ten. CONCLUSIONS: To our knowledge, this is the first documented case showing both panuveitis and ischemic vasculitis with possible perineural inflammation. We do not recommend performing bilateral brolucizumab injections until more data is available regarding the mechanism of brolucizumab-induced vasculitis. From a clinical point of view, we find it difficult to justify the use of brolucizumab when there are other well-known agents, such as ranibizumab and aflibercept, which have better safety profiles and comparable efficacy.