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You review a 35-year-old woman with progressive loss of vision in her right eye over the past few days. She states there was pain a few days ago but it has settled as her vision has worsened. On examination she has a central scotoma and fundoscopy reveals the following retinal appearance:

What is the SINGLE most likely underlying cause of this retinal appearance?

B12 deficiency

Diabetes mellitus

Herpes zoster infection

Multiple sclerosis

Temporal arteritis