27th June 2023

A 53-year-old woman has noticed weakness in holding up her head and dropping of her eyelids

A 53-year-old woman has noticed weakness in holding up her head and dropping of her eyelids. She has a past medical history of hypothyroidism. On examination, she also has limb weakness.

Select the SINGLE most appropriate investigation in making a diagnosis from the list below. Select ONE option only.