MS-4079

MS-4079

A 28-year-old woman visits her doctor complaining of fatigue. She reports feeling weak for the past few months, especially towards the end of the day. She denies any changes in her sleep patterns, mood, diet, or weight. Additionally, she mentions experiencing double vision at times.

During the examination, the doctor observes partial ptosis in both eyes, with the left eye being more affected. The patient’s other cranial nerves appear normal, and her limbs have a power of 4/5. Her sensation and reflexes are intact.

What is the underlying pathophysiology of the probable diagnosis?