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Living with Isolated focal cortical dysplasia type II

A brain development condition that causes hard-to-control seizures, usually starting in early childhood.

Understanding Isolated focal cortical dysplasia type II

Isolated focal cortical dysplasia type II is a brain development condition that causes seizures that are hard to control with medicine.

There are two subtypes: IIA, without balloon cells, and IIB, with balloon cells. Seizures usually start in early childhood. Some people have lasting intellectual disability. Most people need surgery to remove the affected brain tissue to lessen how often and how severe the seizures are.

Signs & symptoms

Symptoms vary from person to person. GARD's summary describes these features:

  • Seizures that are hard to control
  • Seizures starting in early childhood
  • Lasting intellectual disability in some people

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

    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: 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 Epilepsy Foundation
  • 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
Which subtype, IIA or IIB, does my child have?
Is my child a candidate for epilepsy surgery?
What support helps with learning and development?

Quick facts

GARD says changes in genes (also called variants) cause this condition. It is a malformation of how the brain developed.

GeneticNeurological

Also known as: cortical dysplasia of taylor; cortical dysplasia, taylor type; fcd type ii; fcord2; focal cortical dysplasia type ii; focal cortical dysplasia, type ii, somatic

Patient organizations

Broader rare-disease groups

Source: NIH GARD · Isolated focal cortical dysplasia type IIGARD ID 10190 · 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 Isolated focal cortical dysplasia type II.

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