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Living with Chudley-McCullough syndrome

A rare genetic condition with severe hearing loss in both ears and a complex difference in how the brain formed.

Understanding Chudley-McCullough syndrome

Chudley-McCullough syndrome is a rare genetic form of deafness with severe to profound hearing loss in both ears and brain differences.

Hearing loss is present at birth or progresses rapidly in infancy. The brain differences can include extra fluid (hydrocephalus), a partly missing corpus callosum, and folding differences in the brain's outer layer. Some people have fluid-filled sacs (arachnoid cysts). GARD says major physical differences and delays in development are usually not part of this condition. It lists onset in the newborn period and infancy.

Signs & symptoms

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

  • Severe hearing loss from inner ear nerve damage
  • Partly missing corpus callosum
  • Extra grooves in the brain (polymicrogyria)
  • Fluid-filled sacs around the brain (arachnoid cysts)
  • Mild intellectual disability
  • Delayed motor skills

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, ear, nose, and throat specialists and genetic specialists.

  3. Consider genetic testing

    Changes in GPSM2 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); Ear, nose, and throat specialists (otolaryngologists); 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 National Organization of Disorders of the Corpus Callosum
  • 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 GPSM2 genetic testing confirm the diagnosis?
What options are there to help with hearing and communication?
How often should the brain be checked with imaging?

Quick facts

Symptoms usually startNewborn and as an Infant
InheritanceAutosomal Recessive
GenesGPSM2

GARD says changes in the GPSM2 gene cause this condition. It is autosomal recessive, so a child inherits a changed copy of the gene from each parent.

GeneticNeurological

Also known as: chudley mccullough syndrome; cmcs; deafness, autosomal recessive 82; deafness, sensorineural, with partial agenesis of the corpus callosum and arachnoid cysts

Patient organizations

Source: NIH GARD · Chudley-McCullough syndromeGARD ID 86 · 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 Chudley-McCullough syndrome.

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