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Unilateral facial nerve palsy (FNP), with an incidence of around 25 per 100,000 population, is a common neurologic disorder mimicking a stroke. It often leads to emergency department visits. Bellâs palsy, also known as idiopathic facial paralysis, is the most common cause of unilateral facial paralysis, accounting for approximately 70% of these cases . Bilateral FNP is exceedingly rare, representing less than 2% of all the facial palsy cases, and has an incidence of 1 per 5,000,000 population [2, 3].
Bell's palsy is defined as a one-sided facial nerve paralysis of unknown cause. Several other conditions can also cause facial paralysis, e.g., brain tumor, stroke, myasthenia gravis, and Lyme disease; however, if no specific cause can be identified, the condition is known as Bell's palsy.It is thought that an inflammatory condition leads to swelling of the facial nerve.ell's palsy is a form of facial paralysis resulting from a dysfunction of the cranial nerve VII (the facial nerve) causing an inability to control facial muscles on the affected side. Often the eye in the affected side cannot be closed. The eye must be protected from drying up, or the cornea.