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Photo courtesy of: Patrick Ma, M.D. Used with permission. Not to be reproduced.

A 62-year-old man with a past medical history significant for a brain tumor treated with external beam radiation one year ago presents with bilateral retinal vascular occlusions on dilated exam.  His latest MRI showed no recurrence of the brain tumor.

The most likely cause for these retinal findings is:

b -- radiation retinopathy Radiation Retinopathy Radiation retinopathy is caused by endothelial cell damage of the retinal vasculature. Retinopathy usually occurs 9-36 months after treatment. Retinal findings include cotton wool spots, vascular occlusions, retinal hemorrhages, miroaneurysms, telangiectasis, and neovascularization.