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Living with CK syndrome

A rare X-linked condition with learning disability, seizures in infancy, a small head, and distinct facial features.

Understanding CK syndrome

CK syndrome is a rare, genetic, X-linked syndrome of intellectual disability.

Features include mild to severe intellectual disability, seizures starting in infancy, a head that grows slowly after birth, and differences in how the brain's outer layer formed. People have distinct facial features and a thin build. Others may include long, slim fingers and toes, crossed eyes, low muscle tone, stiffness, and behavior problems. GARD lists onset in the newborn period and infancy.

Signs & symptoms

Symptoms vary from person to person. GARD lists these among the most common:

  • Small head size (microcephaly)
  • Delayed speech and language
  • Behavior differences, such as aggression
  • Crossed eyes (strabismus)
  • Almond-shaped eyes
  • Crowded teeth

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include brain and nervous system specialists and genetic specialists.

  3. Consider genetic testing

    Changes in NSDHL are linked to this condition. Genetic testing and counseling can help confirm a diagnosis and explain what it means for your family.

Care & treatment

Care team
Brain and nervous system specialists (neurologists); Genetic specialists (geneticists)
Expert care
Ask about multidisciplinary care centers for rare conditions
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 rare disease patient organizations for support
  • 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
Bring these questions to your next doctor visit
Can NSDHL genetic testing confirm the diagnosis?
How should seizures be monitored?
What supports can help with learning and behavior?

Quick facts

Symptoms usually startNewborn and as an Infant
InheritanceX-Linked
GenesNSDHL

GARD says changes in the NSDHL gene cause this condition. It is X-linked, which means the gene is on the X chromosome.

GeneticNeurologicalInherited Metabolic

Also known as: ck syndrome, x-linked recessive; x-linked intellectual disability-microcephaly-cortical malformation-thin habitus syndrome; x-linked intellectual disability, microcephaly, cortical malformation, thin habitus syndrome

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · CK syndromeGARD ID 17210 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with CK syndrome.

Explore the CK syndrome blog

Explore research for CK syndrome

Explore actively recruiting CK syndrome studies with HealthSpark.

HealthSpark

Find actively recruiting studies for CK 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

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Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.

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