Craniodiaphyseal Dysplasia: Causes, Symptoms, and Treatment
Medically reviewed by Achuta Uppu, MD, Internal Medicine. Last reviewed: October 23, 2026.
What kind of doctor treats Craniodiaphyseal Dysplasia?
A medical geneticist, a doctor who diagnoses inherited conditions, usually leads care. An ear, nose, and throat doctor (ENT) and a craniofacial surgeon, a surgeon for skull and face bones, are often involved. A direct primary care or concierge doctor can be a first stop for an evaluation and can refer you to a specialist when needed.
What is craniodiaphyseal dysplasia?
Craniodiaphyseal dysplasia, or CDD, is a rare genetic disorder of bone. It causes heavy, thick extra bone, mostly in the skull and face.
Bone keeps building up over time, and the extra bone can crowd the brain. The bone growth can cause severe changes in the shape of the face and skull. The facial change can be so severe that it is called leontiasis ossea, or lion-like face.
Symptoms
Problems often start early in life. Signs and problems can include:
- A jaw that sticks out and a wide or flat nasal bridge.
- Narrowed nasal openings, called choanal stenosis.
- Hearing loss, which can get worse over time.
- Narrowing of the middle ear space and the canals for the hearing and facial nerves.
- Severe nerve problems in childhood, as bone narrows the openings in the skull where nerves pass.
Pressure on nerves and the brain can lead to blindness and hearing loss. In one report, a child had signs of high pressure inside the skull.
Causes and who gets it
CDD is a genetic disorder. The NIH Genetic Testing Registry lists a form called autosomal dominant craniodiaphyseal dysplasia. The gene linked to it is SOST, which makes a protein called sclerostin.
CDD is rare. A similar disorder, craniometaphyseal dysplasia, looks much like it.
How doctors diagnose it
Doctors can tell CDD from craniometaphyseal dysplasia with x-rays taken over time. A CT scan of the temporal bone, the bone around the ear, can show narrowing in the ear. Hearing tests are repeated over time.
Genetic tests are available, including tests that read the whole coding region of a gene.
Treatment
Doctors have tried both medical and surgical treatment.
In one report, a child with brain pressure had surgery to take pressure off the brain. The child later had more surgery to reshape the skull and face.
In one report, benefits from surgery for narrowed nasal openings and from craniofacial remodelling were short-lived. In the same report, a medicine called calcitriol, with a low-calcium diet, did not change how the disease progressed.
Treatment aimed at the bone problem has the best chance of working if it starts in infancy. Close watching over time is needed.
When to see a doctor
Tell a doctor right away about new vision loss, new hearing loss, or signs of pressure inside the skull.
Call 911 or go to the emergency room if there is trouble breathing, fainting, or a sudden change in mental state.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance, while a concierge doctor usually charges more and often works alongside insurance. A direct primary care doctor can help arrange visits with a geneticist, an ear, nose, and throat doctor, and other specialists. They can also keep track of follow-up care over time.
Common questions
Is craniodiaphyseal dysplasia a genetic disorder?
Yes, it is a genetic disorder of bone. The gene linked to the autosomal dominant form is SOST.
Can craniodiaphyseal dysplasia cause hearing loss?
Yes, it can. In one report, hearing loss got worse over time.
Can surgery cure craniodiaphyseal dysplasia?
No, not in the cited reports. Surgery eased pressure on the brain in one child, but benefits from some other surgeries were short-lived.
How is craniodiaphyseal dysplasia different from craniometaphyseal dysplasia?
They are similar disorders that doctors can tell apart with x-rays. Both are rare genetic bone disorders, but the underlying defect appears to be different.
Sources
- NIH Genetic Testing Registry - Craniodiaphyseal dysplasia, autosomal dominant
- PubMed - Craniometaphyseal and craniodiaphyseal dysplasia, head and neck manifestations and management
- PubMed - Intracranial and extracranial reduction osteoplasty for craniodiaphyseal dysplasia
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
