Craniosynostosis, Boston type (Orphanet rare-disease nomenclature term Orphanet_1541) (CSB) is a rare syndromic craniosynostosis chiefly characterized by forehead retrusion, frontal bossing, turribrachycephaly, and cloverleaf skull with no apparent hand or foot abnormalities. Also known as: Craniosynostosis, Warman type, Warman-Mulliken-Hayward syndrome.