Living with C syndrome
A rare genetic syndrome with a pointed forehead, severe intellectual disability, low muscle tone, and heart differences.
Understanding C syndrome
Other features include low muscle tone, a range of heart differences, extra folds of skin, joint and limb differences, and distinct facial features. Signs can start during pregnancy or at birth. The inheritance pattern varies, and many cases occur by chance.
Signs & symptoms
Symptoms vary from person to person. GARD lists these among the most common:
- Pointed forehead (trigonocephaly)
- Severe intellectual disability
- Small head (microcephaly)
- Heart differences
- Slow weight gain in infancy
- Crossed eyes and upslanted eye openings
Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.
Diagnosis
- 1Talk with your doctor
Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.
- 2See a specialist
Specialists who may be involved include bone and joint specialists, brain and nervous system specialists and genetic specialists.
- 3Consider genetic testing
Changes in CD96 are linked to this condition. Genetic testing and counseling can help confirm a diagnosis and explain what it means for your family.
- 4Connect with expert centers
World Craniofacial Foundation may keep lists of experts for this condition.
Care & treatment
- Care team
- Bone and joint specialists (orthopedists or orthopedic surgeons); Brain and nervous system specialists (neurologists); Genetic specialists (geneticists)
- Expert care
- Expert lists: World Craniofacial Foundation
- Treatment
- GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
- Research
- Clinical trials and observational studies may be options. See the research section below.
General information, not medical advice. Your care team makes the decisions.
Everyday life
Living with a rare condition is easier with support.
- Connect with World Craniofacial Foundation and other patient organizations
- Keep notes on symptoms, changes and questions for appointments
- Ask about patient registries that help research
- Look into financial aid and travel resources for care visits
Quick facts
Some cases have been linked to the CD96 gene. Many cases occur by chance, and more than one inheritance pattern has been suggested.
Also known as: opitz c trigonocephaly; opitz trigonocephaly c syndrome; opitz trigonocephaly syndrome; otcs; trigonocephaly c syndrome; trigonocephaly syndrome
Patient organizations
- World Craniofacial FoundationCraniofacial anomalies · United States
- Children's Craniofacial AssociationCraniofacial anomalies · United States
- FACES: The National Craniofacial AssociationCraniofacial anomalies · United States
- myFaceCraniofacial anomalies · United States
You are more than your diagnosis
Perspectives from people navigating life with C syndrome.
Explore research for C syndrome
Explore actively recruiting C syndrome studies with HealthSpark.
Find actively recruiting studies for C syndrome with HealthSpark. Share your city to explore research near you.
- Recruiting studies from ClinicalTrials.gov
- Share your city to look for research near you
- Eligibility is confirmed by the study team
Powered by HealthSpark, our AI chat helper
I can help you find recruiting C syndrome studies. Enter a ZIP code, address or city below and I'll look within 50 miles.
Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.
Get Signals for C syndrome
Stay in the loop with community stories and updates from medical researchers.
Create a living journal that talks back
HealthStory evolves private journaling with a living AI journal that talks back and asks thoughtful questions, helping you capture your C syndrome experiences more deeply and prepare for better conversations with your doctors and care team.
Your journal is private. Sharing your story publicly is a separate choice, made with Share your story above.