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Living with Bilateral polymicrogyria

A rare brain condition with too many small folds on the surface of the brain on both sides, affecting development and causing seizures.

Understanding Bilateral polymicrogyria

Bilateral polymicrogyria is a rare brain difference in which the outer brain has many excessively small folds on both sides.

It comes from abnormal movement of nerve cells during brain development. It can show up as developmental delay, intellectual disability, seizures, and other nervous system problems. It may stand alone, be part of a genetic syndrome, or be linked to cytomegalovirus infection around birth.

Signs & symptoms

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

  • Seizures
  • Delays in overall development
  • Delayed speech and language
  • Intellectual disability
  • Movement and balance problems
  • Eyes turning inward (esotropia)

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 seizure and epilepsy specialists.

  3. Ask which tests can help

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

  4. Connect with expert centers

    PMG Awareness Organization and Epilepsy Foundation may keep lists of experts for this condition.

Care & treatment

Care team
Brain and nervous system specialists (neurologists); Genetic specialists (geneticists); Seizure and epilepsy specialists (epileptologist)
Expert care
Expert lists: PMG Awareness Organization, Epilepsy 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 PMG Awareness Organization 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
Bring these questions to your next doctor visit
Could a genetic syndrome or infection be behind this?
What therapies can support development?
How will seizures be followed and managed?

Quick facts

Symptoms usually startNewborn and as an Infant
InheritanceAutosomal Recessive, X-Linked

Changes in genes cause this condition. It can be autosomal recessive or X-linked. It may also be linked to cytomegalovirus infection around birth.

GeneticNeurological

Patient organizations

Source: NIH GARD · Bilateral polymicrogyriaGARD ID 17269 · 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 Bilateral polymicrogyria.

Explore the Bilateral polymicrogyria blog

Explore research for Bilateral polymicrogyria

Explore actively recruiting Bilateral polymicrogyria studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Bilateral polymicrogyria with HealthSpark. Share your city to explore research near you.

  • Recruiting studies from ClinicalTrials.gov
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  • 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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