Craniodiaphyseal dysplasia

Craniodiaphyseal dysplasia (CDD) is an extremely rare skeletal disorder characterized by massive generalized hyperostosis and sclerosis of the skull and facial bones, along with sclerosis and hyperostosis of the diaphyses (shafts) of long bones. The condition leads to progressive thickening and distortion of the craniofacial bones, resulting in a dramatically altered facial appearance sometimes described as 'leontiasis ossea' (lion-like facies). The excessive bone growth in the skull can cause narrowing and obstruction of cranial foramina, leading to serious complications including compression of cranial nerves, which may result in facial palsy, hearing loss, visual impairment, and even blindness. Obstruction of the nasal passages and paranasal sinuses is common, causing breathing difficulties. Increased intracranial pressure may also develop due to reduced intracranial space. The condition typically manifests in early infancy or childhood, with progressive facial distortion and neurological complications worsening over time. Affected individuals may also exhibit wide nasal bridge, hypertelorism (widely spaced eyes), and mandibular enlargement. The long bones show cortical thickening and diaphyseal sclerosis, though the epiphyses are generally spared. Intellectual development may be affected in some cases due to increased intracranial pressure. There is currently no cure for craniodiaphyseal dysplasia. Treatment is primarily supportive and symptomatic. Surgical intervention may be attempted to decompress cranial nerves, relieve nasal obstruction, or reduce intracranial pressure, but bone regrowth after surgery is common and outcomes are often limited. Repeated surgical procedures may be necessary. The prognosis is generally poor, with many patients experiencing significant morbidity from progressive cranial nerve compression and potential life-threatening complications. Both autosomal dominant and autosomal recessive forms have been described, with the autosomal dominant form being more commonly reported in the literature.

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