Asymmetric facial appearance
may originate from abnormalities of facial musculature or facial innervation. Congenital
absence or hypoplasia of facial muscles has not been known except for the depressor
anguli oris muscle. Even, congenital unilateral
hypoplasia of the orbicularis oris muscle cause of unilateral upper lip palsy has
not been reported in the literature up to day. In this report, we present a patient with congenital unilateral upper lip palsy although
the facial nerve was normal.
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