Hemorrhage between the skull and periosteum of a newborn resulting from rupture of blood vessels that cross the periosteum. [https://orcid.org/0000-0001-5208-3432]

A cephalohematoma (American English), also spelled cephalohaematoma (British English), is a hemorrhage of blood between the skull and the periosteum at any age, including a newborn baby secondary to rupture of blood vessels crossing the periosteum. Because the swelling is subperiosteal, its boundaries are limited by the individual bones, in contrast to a caput succedaneum. .