1 MCQs in Medicine for NEET PG
A 58-year-old strict vegan woman presents with 6 months of progressive bilateral painless vision loss and difficulty reading small print. She reports tingling in her feet and imbalance in the dark. Serum vitamin B12 is 95 pg/mL (normal >200). Fundoscopy shows the finding marked **A** in the diagram. Which of the following best explains the pathophysiology of the optic nerve involvement in this patient's vitamin B12 deficiency?
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