Mandibulofacial dysostosis also known as Treacher Collins syndrome is an inherited developmental disorder characterized by underdeveloped facial bones and a very small lower jaw and chin, called micrognathia. The most obvious facial differences are the underdeveloped cheekbones and the drooping lower eyelids It is recognized at birth and can also be diagnosed prenatally based on ultrasonography findings. The images shows the characteristic features of this condition. https://emedicine.medscape.com/article/946143-overview