You are what you eat: ophthalmological manifestations of severe B12 deficiency

Severe B₁₂ vitamin deficiency due to diminished dietary intake is a known cause of severe pancytopenia with bleeding diathesis. The authors report a case with sudden-onset bilateral vision loss, severe pancytopenia and multiple organ failure secondary to B₁₂ vitamin deficiency in a patient with a strict vegetarian diet. On funduscopic examination the patient had multiple bilateral exuberant haemorrhages in all retinal layers. Five months after presentation, he had a complete visual recovery without ophthalmological intervention.

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