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Living with Complex neurodevelopmental disorder

A rare genetic form of intellectual disability that comes with other differences but does not match a known syndrome.

Understanding Complex neurodevelopmental disorder

Complex neurodevelopmental disorder is a rare genetic intellectual disability that comes with other differences not fitting a defined syndrome.

Along with intellectual disability, people can have differences in the face, nervous system signs, behavior problems and differences in other organ systems.

Signs & symptoms

GARD doesn't list specific symptoms for this condition yet. The summary describes these:

  • Intellectual disability
  • Facial differences
  • Nervous system signs and symptoms
  • Behavior problems
  • Differences in other organ systems

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. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

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
Would genetic testing help find the cause?
Which specialists should be part of our care team?
What educational support is available?

Quick facts

GARD says changes in genes cause this condition, but doesn't list a specific gene or inheritance pattern.

GeneticNeurological

Also known as: non-specific syndromic intellectual disability

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Complex neurodevelopmental disorderGARD ID 17965 · 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 Complex neurodevelopmental disorder.

Explore the Complex neurodevelopmental disorder blog

Explore research for Complex neurodevelopmental disorder

Explore actively recruiting Complex neurodevelopmental disorder studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Complex neurodevelopmental disorder 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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