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Living with X-linked intellectual disability-cardiomegaly-congestive heart failure syndrome

A rare X-linked condition with profound learning disability, seizures, stiff joints, and heart enlargement that appears in middle age.

Understanding X-linked intellectual disability-cardiomegaly-congestive heart failure syndrome

This is a rare X-linked syndrome with profound intellectual disability, seizures, and heart problems that start in middle age.

GARD lists developmental delay with absent speech, large stiff joints, and unusual thumb positions. Heart enlargement and heart valve problems appear in middle age and can lead to heart failure. Large ears with an overfolded edge and large testes are also described. Signs begin in the newborn period or infancy.

Signs & symptoms

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

  • Profound intellectual disability
  • Global developmental delay with absent speech
  • Seizures
  • Stiff large joints (contractures)
  • Enlarged heart
  • Heart failure

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, genetic specialists and heart and blood vessel specialists.

  3. Consider genetic testing

    Changes in CLIC2 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); Heart and blood vessel specialists (cardiologists)
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
Could CLIC2 genetic testing help our family?
How often should the heart be checked?
Which specialists should be on my care team?

Quick facts

Symptoms usually startNewborn and as an Infant
InheritanceX-Linked
GenesCLIC2

This condition is caused by changes in the CLIC2 gene and follows X-linked inheritance.

GeneticNeurological

Also known as: intellectual developmental disorder, x-linked syndromic 32, x-linked recessive; intellectual disability, x-linked, syndromic 32; intellectual disability, x-linked, syndromic type 32; mrxs32

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · X-linked intellectual disability-cardiomegaly-congestive heart failure syndromeGARD ID 17485 · 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 X-linked intellectual disability-cardiomegaly-congestive heart failure syndrome.

Explore the X-linked intellectual disability-cardiomegaly-congestive heart failure syndrome blog

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