How is Cleidocranial Dysplasia diagnosed?

Cleidocranial dysplasia is primarily diagnosed through a combination of physical examination, characteristic skeletal findings on X-rays, and molecular genetic testing for mutations in the RUNX2 gene. While clinical features often suggest the diagnosis, confirmation is typically achieved by identifying a pathogenic variant in the RUNX2 gene, which is found in approximately 70% of individuals with the condition.

How is Cleidocranial Dysplasia diagnosed?

The diagnostic process for cleidocranial dysplasia usually begins with a physical assessment of hallmark features, such as delayed closure of the fontanelles, hypoplastic or absent clavicles, and dental anomalies. Because cleidocranial dysplasia is rare, patients often experience a "diagnostic odyssey," spending years visiting various specialists before a definitive diagnosis is reached. If you have felt unheard or frustrated by this process, please know your experience is common within our community of 89 cleidocranial dysplasia members at DiseaseMaps.org; persistent advocacy is often required.

What tests confirm Cleidocranial Dysplasia?

Diagnosis is finalized using a multi-disciplinary approach involving imaging and genetic analysis:

• Radiographic Imaging: X-rays of the shoulders, skull, and pelvis reveal pathognomonic signs, such as absent or underdeveloped clavicles and multiple supernumerary (extra) teeth.


• Genetic Testing: Sequencing of the RUNX2 gene is the gold standard for confirming cleidocranial dysplasia.


• Clinical Evaluation: A physical exam focusing on skeletal development and dental eruption patterns.

Which specialists are involved in diagnosing Cleidocranial Dysplasia?

Because cleidocranial dysplasia affects multiple systems, a team is essential. You should seek evaluation from a clinical geneticist, a pediatric or adult craniofacial specialist, and an orthodontist or oral surgeon. If your primary care physician is unfamiliar with cleidocranial dysplasia, requesting a referral to an academic medical center or a skeletal dysplasia clinic can significantly shorten the time to diagnosis.

What conditions mimic Cleidocranial Dysplasia?

Differential diagnosis is crucial, as cleidocranial dysplasia can be confused with other conditions involving skeletal abnormalities, such as pycnodysostosis, mandibulofacial dysostosis, or various forms of osteogenesis imperfecta. Distinguishing these requires careful clinical observation and, frequently, specific genetic panel testing to rule out other rare bone disorders.

Next steps

• Consult a clinical geneticist to discuss RUNX2 gene testing.


• Request a referral to a craniofacial team or a skeletal dysplasia center of excellence.


• Connect with the 89 members in our DiseaseMaps.org community to share experiences and find supportive providers.


• Keep a detailed file of all X-rays and dental imaging to share with new specialists.

Medical disclaimer: This content is for informational purposes only and does not constitute medical advice, diagnosis, or treatment; always seek the advice of your physician or other qualified health provider with any questions regarding a medical condition.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Cleidocranial dysplasia.


• Orphanet: Cleidocranial dysplasia (ORPHA:205).


• OMIM (Online Mendelian Inheritance in Man): Cleidocranial Dysplasia; CCD (Entry #119600).


• Children's Craniofacial Association (CCA) resources on skeletal dysplasias.