MedGen

Craniodiaphyseal dysplasia (CDD) is a severe bone dysplasia characterized by massive generalized hyperostosis and sclerosis, especially involving the skull and facial bones. Progressive bony encroachment upon cranial foramina leads to severe neurologic impairment in childhood (summary by Brueton and Winter, 1990). The sclerosis is so severe that the resulting facial distortion is referred to as 'leontiasis ossea' (leonine facies), and the bone deposition results in progressive stenosis of craniofacial foramina (summary by Kim et al., 2011). [from OMIM]

Craniodiaphyseal dysplasia is a rare sclerotic bone disorder with a variable phenotypic expression with massive generalized hyperostosis and sclerosis, particularly of the skull and facial bones, that may lead to severe deformity. [from ORDO]