[1] Ignatowicz R, Gdakowicz B. Dyzostoza czaszkowo-twarzowa Crouzona [Craniofacial dysostosis of the Crouzon type]. Wiad Lek. 1971 Feb 15;24(4):363-6. Polish. PMID: 5552301.

Figure 1: Hallmark features associated with Crouzon syndrome. The presence of frontal bossing, hypertelorism, maxillary hypoplasia, mandibular prognathism, a shallow orbit, exophthalmos, and bilateral proptosis (A). Wide spacing of teeth and a high-arched palate (B). Syndactyly of the feet bilaterally (C). And radiographic evidence, revealing a distinctive "copper beaten" appearance, as well as fusion of the 2^nd/3^rd cervical vertebrae and the 4^th/5^th cervical vertebrae (D).