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Living with Congenital bilateral perisylvian syndrome

A rare brain condition where folds around the brain's Sylvian fissure form differently, affecting speech, swallowing, learning and seizures.

Understanding Congenital bilateral perisylvian syndrome

Congenital bilateral perisylvian syndrome is a rare condition of the brain's outer layer, mainly around the Sylvian fissure on both sides.

The brain's grooves form incorrectly, leading to many small extra folds. Symptoms appear at birth, in infancy or later in childhood. They can include weakness of the face, tongue, jaw and throat, trouble speaking and swallowing, and drooling. Many people have seizures and mild to severe intellectual disability.

Signs & symptoms

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

  • Weakness of the face, tongue, jaw and throat
  • Trouble speaking and swallowing
  • Seizures
  • Mild to severe intellectual disability
  • Delayed speech and language
  • Muscle stiffness (spasticity)

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
Would genetic testing help find the cause?
What do the brain scan results mean?
What speech and feeding therapy can help?

Quick facts

Symptoms usually startduring Pregnancy, at Birth, and as an Infant
InheritanceAutosomal Recessive

It can be caused by changes in single genes or chromosome changes such as 22q11.2 deletion syndrome. It has also been reported with complications in twin pregnancies. GARD lists autosomal recessive inheritance.

GeneticNeurological

Also known as: bilateral perisylvian polymicrogyria; perisylvian syndrome

Patient organizations

Source: NIH GARD · Congenital bilateral perisylvian syndromeGARD ID 6011 · 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 Congenital bilateral perisylvian syndrome.

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