Asymmetric neonatal crying: microdeletion, infection or birth injury?--a case report.

Asymmetric neonatal crying is a rare minor congenital abnormality caused by unilateral agenesis or hypoplasia of depressor anguli oris muscle and depressor labii inferioris muscle. It is either an isolated clinical finding or one of the clinical findings included in several malformation syndromes linked to a microdeletion within a chromosomal region 22q11.2.