a Uveitis Services , Medical Research Foundation , Chennai , India.
b Vision Research Foundation, Larsen & Toubro Microbiology Research Centre , Chennai , India.
Ocul Immunol Inflamm. 2018;26(5):776-778. doi: 10.1080/09273948.2016.1265654. Epub 2016 Dec 23.
Frosted branch angiitis (FBA), a rare form of retinal vasculitis presenting as bilateral perivascular sheathing, resembling the appearance of frosted tree branches in winter, was first reported by Ito et al. in 1976, in a young immunocompetent boy. FBA predominantly affects healthy young patients, the youngest reported in an 11-month-old infant and oldest in a 42-year-old patient. Classical symptoms include sudden onset of blurred vision with floaters and photopsiae. Fundus examination shows widespread perivascular translucent sheathing affecting both arterioles and venules, more commonly latter. Fluorescein angiography shows late staining of vessels with no obstruction of blood flow. Electroretinogram shows reduced amplitude and visual fields show generalized constriction. Medline search did not show any case of frosted branch angiitis in a patient with typhoid fever.
霜样树枝状血管炎（Frosted Branch Angiitis，FBA），一种罕见的视网膜血管炎，表现为双侧血管周围鞘，类似于冬季霜状树枝的外观，于 1976 年由 Ito 等人首次报道，发生于一名年轻的免疫功能正常的男孩。FBA 主要影响健康的年轻患者，年龄最小的见于 11 个月大的婴儿，最大的见于 42 岁的患者。典型症状包括突发视力模糊、伴有飞蚊症和闪光感。眼底检查显示广泛的血管周围半透明鞘，影响小动脉和小静脉，后者更为常见。荧光素血管造影显示晚期血管染色，无血流阻塞。视网膜电图显示振幅降低，视野显示广泛收缩。Medline 检索未显示任何伤寒患者出现霜样树枝状血管炎的病例。
