<unk> , also known as agnathia–otocephaly complex, is a very rare and lethal cephalic disorder characterized by the absence of the mandible (agnathia), with the ears fused together just below the chin (synotia). It is caused by a disruption to the development of the first branchial arch. It occurs in every 1 in 70,000 embryos.
Otocephaly
Möbius syndrome
Oxycephaly
Treacher Collins syndrome
Plagiocephaly
Goldenhar syndrome
Cebocephaly
Trigonocephaly