RT Journal Article SR Electronic T1 Lessons of the month 2: Retinal vasculitis: a first presentation of Takayasu's arteritis JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP e673 OP e676 DO 10.7861/clinmed.2021-0538 VO 21 IS 6 A1 Hagar Ibrahim A1 Shane D'souza A1 Eleftherios Agorogiannis A1 Alia Ali A1 Nada Bashar A1 Ian Pearce A1 Savita Madhusudhan YR 2021 UL http://www.rcpjournals.org/content/21/6/e673.abstract AB Takayasu's arteritis is a chronic, systemic, large-vessel vasculitis affecting the aorta and its primary branches. However, coronary, renal and pulmonary arteries and small vessel involvement has been documented. We describe a rare case of Takayasu's arteritis with extensive supra-aortic arch disease, manifesting with bilateral occlusive retinal vasculitis as a first presentation. This is elicited by fundus findings of vascular sheathing and fundus fluoresceine angiography evidence of retinal vessel occlusion and peripheral capillary non-perfusion.