1st April 2022

A 37-year-old man presents with sudden onset unilateral facial weakness

A 37-year-old man presents with sudden onset unilateral facial weakness involving an inability to raise his left eyebrow and drooping of the left corner of his mouth. A diagnosis of Bell’s palsy is made and he undergoes serial electroneuronography (ENoG) 72 hours after onset of symptoms which shows a 92% reduction in the amplitude of compound muscle action potential (CMAP) on his left compared to his right side.

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