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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:

a. tumor metastasis to the choroid b. radiation retinopathy c. sickle cell retinopathy d.  increased intracranial pressure

For answers to the above, click here on or after December 13, 2005.