(Also called Goldenhar syndrome, brachial arch syndrome, facio-auriculo-vertebral syndrome, oculo-auriculo-vertebral spectrum, or lateral facial dysplasia.) - a condition in which the tissues on one side of the face are underdeveloped, affecting primarily the ear (aural), mouth (oral), and jaw (mandibular) areas. Sometimes, both sides of the face can be affected and may involve the skull, as well as the face.
Hemifacial microsomia is a congenital disorder that affects the development of the lower half of the face, most commonly the ears, the mouth and the mandible. It can occur on one side of the face or both. If severe it can lead to difficulties in breathing, obstructing the trachea and requiring a tracheotomy.