Idiopathic bilateral facial palsy is a rare entity with an incidence range between 0.2% and 0.3%. Granulomatosis with polyangiitis disease, Guillain Barré Syndrome, Systemic Lupus Erythematosus and infectious diseases such as neurosyphilis, parotiditis or borrelliosis are the main secondary causes of peripheral bilateral facial palsy. Genetic diseases such as Möbius syndrome and neurofibromatosis type II are other differential diagnoses to be considered.
