Crouzon syndrome (CS) is an autosomal dominant disorder characterized by generalized craniosynostoses, maxillary hypoplasia, widely spaced but shallow orbits with prominent globes. Heterozygous mutations of FGFR2 cause three classical craniosynostosis syndromes, Apert, Crouzon and Pfeiffer. Crouzon syndrome is usually the mildest of the FGFR2-associated disorders and the clinical diagnosis is suggested by the combination of characteristic facies and absence of major abnormalities of the hands and feet. It has also been reported that a mutation of FGFR3 gene causes Crouzon syndrome with acanthosis nigricans.
