Brachycephaly

In people, brachycephaly, also known as flat head syndrome, is a type of cephalic disorder. It is a normal variation in some domesticated dog and cat breeds, and can be normal or abnormal in other animal species. In humans, the disorder results from premature fusion of the coronal sutures (see craniosynostosis) or from external deformation (see plagiocephaly). The coronal suture is the fibrous joint that unites the frontal bone with the two parietal bones of the skull. The parietal bones form the top and sides of the skull. This feature can be seen in Down syndrome.