Overview
Hypomandibular faciocranial dysostosis is an extremely rare condition that affects the development of the bones of the face and skull. The most striking feature is a severely underdeveloped or nearly absent lower jaw (mandible), which is why the name includes 'hypomandibular.' This condition is also sometimes referred to as auriculocondylar syndrome-related spectrum or agnathia-otocephaly complex, though it represents a distinct entity within the broader group of faciocranial dysostoses. Babies born with this condition typically have a very small or missing lower jaw, abnormalities of the ears, and other facial bone malformations. The underdeveloped jaw can cause serious problems with breathing and feeding from birth, as the airway may be blocked or narrowed. Other features may include abnormalities of the skull bones, cleft palate, and sometimes problems with other organ systems. Because this condition is so rare, there is no specific cure. Treatment focuses on managing symptoms and supporting the child's ability to breathe and eat. This often requires a team of specialists and may involve multiple surgeries over time, including procedures to reconstruct the jaw and open the airway. Early intervention is critical to ensure the best possible outcomes. The severity of the condition can vary, but it is generally considered a serious and life-threatening disorder, particularly in the newborn period.
Key symptoms:
Severely underdeveloped or absent lower jawBreathing difficulties from birthFeeding difficultiesAbnormally shaped or positioned earsCleft palateAbnormal skull shapeSmall mouth openingAbsent or fused jaw jointHearing lossUnderdeveloped facial bonesTongue abnormalities or displacementAirway obstruction
Clinical phenotype terms (27)— hover any for plain English
Variable
Can be inherited in different ways depending on the underlying gene
Neonatal
Begins at or shortly after birth (first 4 weeks)
Treatments
No FDA-approved treatments are currently listed for Hypomandibular faciocranial dysostosis.
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Specialists
View all specialists →No specialists are currently listed for Hypomandibular faciocranial dysostosis.
Treatment Centers
8 centersBaylor College of Medicine Rare Disease Center ↗
Baylor College of Medicine
📍 Houston, TX
🏥 NORDStanford Medicine Rare Disease Center ↗
Stanford Medicine
📍 Stanford, CA
🔬 UDNNIH Clinical Center Undiagnosed Diseases Program ↗
National Institutes of Health
📍 Bethesda, MD
🔬 UDNUCLA UDN Clinical Site ↗
UCLA Health
📍 Los Angeles, CA
🔬 UDNBaylor College of Medicine UDN Clinical Site ↗
Baylor College of Medicine
📍 Houston, TX
🔬 UDNHarvard/MGH UDN Clinical Site ↗
Massachusetts General Hospital
📍 Boston, MA
🏥 NORDMayo Clinic Center for Individualized Medicine ↗
Mayo Clinic
📍 Rochester, MN
👤 Mayo Clinic Center for Individualized Medicine
🏥 NORDUCLA Rare Disease Day Program ↗
UCLA Health
📍 Los Angeles, CA
Travel Grants
No travel grants are currently matched to Hypomandibular faciocranial dysostosis.
Community
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Caregiver Resources
NORD Caregiver Resources
Support, advocacy, and financial assistance for caregivers of rare disease patients.
Mental Health Support
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Family & Caregiver Grants
Financial assistance programs specifically for caregivers of rare disease patients.
Social Security Disability
Learn how rare disease patients may qualify for SSDI/SSI benefits.
Questions for your doctor
Bring these to your next appointment
- Q1.How severe is my child's jaw underdevelopment, and what does that mean for breathing and feeding?,Will my child need a tracheostomy or feeding tube, and for how long?,What surgical options are available to reconstruct the jaw, and when should they be done?,Is genetic testing recommended, and could this condition affect future children?,What specialists should be part of my child's care team?,What developmental milestones should I watch for, and when should I be concerned?,Are there support groups or resources for families dealing with this condition?
Common questions about Hypomandibular faciocranial dysostosis
What is Hypomandibular faciocranial dysostosis?
Hypomandibular faciocranial dysostosis is an extremely rare condition that affects the development of the bones of the face and skull. The most striking feature is a severely underdeveloped or nearly absent lower jaw (mandible), which is why the name includes 'hypomandibular.' This condition is also sometimes referred to as auriculocondylar syndrome-related spectrum or agnathia-otocephaly complex, though it represents a distinct entity within the broader group of faciocranial dysostoses. Babies born with this condition typically have a very small or missing lower jaw, abnormalities of the ear
At what age does Hypomandibular faciocranial dysostosis typically begin?
Typical onset of Hypomandibular faciocranial dysostosis is neonatal. Age of onset can vary across affected individuals.