Streptococcus mitis endophthalmitis presenting as frosted branch angiitis after intravitreal pegaptanib sodium injection.

An 80-year-old woman presented with endophthalmitis and a frosted branch angiitis-like picture following intravitreal injection of pegaptanib sodium for age-related macular degeneration. After vitreous tap and injection of antibiotics, the patient underwent vitrectomy because her clinical condition worsened. Cultures grew Streptococcus mitis, and the patient's visual acuity stabilized at hand motions following unsuccessful repair of a retinal detachment complicated by proliferative vitreoretinopathy. Because S. mitis can cause an endophthalmitis that presents as frosted branch angiitis, it must be considered in the differential diagnosis of patients who present with frosted branch angiitis.