Tabriz University of Medical Sciences Medical Journal of Tabriz University of Medical Sciences 2783-2031 30 2 2008 06 23 A Case Series of Depressor Anguli Oris Muscle Hypoplasia, Cause of Asymmetric Neonatal Crying Face 145 147 EN TOOPCHIZADEH V BARZEGAR M Journal Article 2009 12 03 Neonatal asymmetric crying facies has incidence of approximately 1 per 160 live births, the cause is either facial nerve compression or faulty muscle and /or nerve development. Depressor anguli oris muscle agenesia or hypoplasia is one of the important causes. Ultrasound imaging of facial muscles and electro diagnostic study may be useful for diagnosis. Associations of this facial defect with congenital anomalies have been reported, including cardiovascular anomaly, genitourinary, CNS and rarely other anomalies. In this report 10 infants with facial asymmetry are presented that are caused by congenital hyperplasia of the depressor anguli oris muscle on one side of the mouth.