Bilateral facial nerve palsy in a child: When the smile returns

Bilateral facial nerve palsy (FNP) is an extremely rare clinical condition. Different from unilateral FNP, because of idiopathic or Bell's palsy in the majority of cases, bilateral FNP is most often correlated to an underlying medical condition, which can be congenital, neurological, infectious, neoplastic, traumatic, or metabolic. We describe the case of an 8-year-old girl with bilateral facial paralysis because of Epstein-Barr virus infection with late diagnosis and therapy. We discuss the differential diagnosis hypothesis, focusing on the different outcome and recovery times in relation to the timing of treatment.