Overview
Fryns-Smeets-Thiry syndrome is an extremely rare genetic condition that affects multiple body systems. It was first described in the medical literature by Fryns, Smeets, and Thiry, and is sometimes referred to by its Orphanet designation (ORPHA:2058). The syndrome is characterized by a combination of skeletal abnormalities, intellectual disability, and distinctive facial features. Affected individuals may have short stature, abnormalities of the hands and feet, and unusual facial characteristics such as a broad nasal bridge or other midface differences. Intellectual disability can range from mild to moderate, and some individuals may also experience delays in speech and motor development. Because this condition is so rare, with only a handful of cases reported in the medical literature, our understanding of the full range of symptoms and the best approaches to treatment remains limited. There is currently no cure or specific targeted therapy for this syndrome. Management is supportive and focuses on addressing individual symptoms, such as physical therapy for motor delays, speech therapy for communication difficulties, and educational support for learning challenges. Regular follow-up with a team of specialists is important to monitor growth, development, and any emerging medical concerns.
Key symptoms:
Intellectual disabilityShort statureDistinctive facial featuresBroad nasal bridgeAbnormalities of the handsAbnormalities of the feetDelayed speech developmentDelayed motor milestonesSkeletal abnormalitiesLow muscle tone
Clinical phenotype terms (19)— hover any for plain English
Autosomal recessive
Passed on when both parents carry the same gene change; often skips generations
Neonatal
Begins at or shortly after birth (first 4 weeks)
Treatments
No FDA-approved treatments are currently listed for Fryns-Smeets-Thiry syndrome.
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Specialists
View all specialists →No specialists are currently listed for Fryns-Smeets-Thiry syndrome.
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 Fryns-Smeets-Thiry syndrome.
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.What specific features led to this diagnosis, and could genetic testing help confirm it?,What therapies (physical, speech, occupational) should we start, and how often?,What developmental milestones should we be watching for, and when should we be concerned?,Are there any other medical complications we should screen for regularly?,What educational supports or accommodations would benefit my child?,Is genetic counseling recommended for our family regarding future pregnancies?,Are there any research studies or registries we can participate in?
Common questions about Fryns-Smeets-Thiry syndrome
What is Fryns-Smeets-Thiry syndrome?
Fryns-Smeets-Thiry syndrome is an extremely rare genetic condition that affects multiple body systems. It was first described in the medical literature by Fryns, Smeets, and Thiry, and is sometimes referred to by its Orphanet designation (ORPHA:2058). The syndrome is characterized by a combination of skeletal abnormalities, intellectual disability, and distinctive facial features. Affected individuals may have short stature, abnormalities of the hands and feet, and unusual facial characteristics such as a broad nasal bridge or other midface differences. Intellectual disability can range from m
How is Fryns-Smeets-Thiry syndrome inherited?
Fryns-Smeets-Thiry syndrome follows a autosomal recessive inheritance pattern. Genetic counseling can help families understand recurrence risk and testing options.
At what age does Fryns-Smeets-Thiry syndrome typically begin?
Typical onset of Fryns-Smeets-Thiry syndrome is neonatal. Age of onset can vary across affected individuals.