A 25-year-old woman has a new episode of optic neuritis and MRI showing periventricular white matter lesions. What is the likely diagnosis?

Answer and explanation

Correct answer: A. Multiple sclerosis

  1. Step 1: Optic neuritis with periventricular lesions suggests demyelination.
Answer
Multiple sclerosis.
Why not the others: Guillain-Barré syndrome presents with ascending weakness.

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