A 30-year-old woman has ptosis and double vision that get worse towards the evening. What is the most likely diagnosis?
Answer and explanation
Correct answer: B. Myasthenia gravis
- Step 1: The picture of fatigable ptosis and diplopia fits Myasthenia gravis.
Answer
Myasthenia gravis.
Why not the others: 'Lambert-Eaton myasthenic syndrome': weakness improves with repeated effort and is associated with small cell lung cancer. 'Thyroid eye disease': it gives proptosis and lid retraction. 'Multiple sclerosis': it gives relapsing neurological deficits with sensory loss.
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