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The first decision to be made is whether the patient has a central (upper motor neurone) or peripheral (lower motor neurone) lesion 1. Describe how you would differentiate between these causes clinically.
Having identified that this patient has a peripheral cause for her facial weakness, the next task is to identify the cause of this. Outline four causes of a peripheral facial nerve lesion and how you would identify them on examination.
Having ruled out an alternative cause, you make the diagnosis of a Bell’s palsy in this patient. Indicate how you would treat this patient pharmacologically.