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Acute unilateral idiopathic facial nerve paralysis
Aetiology unknown -??HSV

''Features''
LMN facial palsy - forehead is affected
post auricular pain (may precede paralysis), altered taste, dry eye, hyperacusis

''Mx''
Prednisolone 25mg bd for 10 days within 72 hr of onset
Acyclovir gives no added benefit
eye care is important - artificial tears

''Prognosis''
if untreated 15% have permanent moderate to severe weakness

Note .... ''Ramsay Hunt syndrome'' - reactivate Herpes Zoster in geniculate ganglion - deafness, vertigo, pain, facial nerve LMN lesion