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Living with Microlissencephaly

A group of rare brain-formation conditions with a very small head, a smooth brain surface, seizures, and severe developmental delay.

Understanding Microlissencephaly

Microlissencephaly describes a group of rare brain-formation conditions with a very small head and a brain surface that has few or no folds.

Microlissencephaly combines lissencephaly (a smooth brain surface with few or no grooves) with a very small head present at birth. It leads to muscle stiffness (spasticity), severe developmental delay, and seizures. It is seen in the newborn period or infancy.

Signs & symptoms

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

  • Smaller-than-average head size (microcephaly)
  • Smooth brain surface (lissencephaly)
  • Seizures
  • Delays in reaching developmental milestones
  • Severe intellectual disability
  • Muscle stiffness and strong reflexes

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
Can genetic testing identify the exact type in my child?
What options are there for managing seizures and muscle stiffness?
Which specialists and therapies should be part of care?

Quick facts

Symptoms usually startNewborn and as an Infant
InheritanceAutosomal Recessive

Changes in genes (also called variants) cause this condition, and it is inherited in an autosomal recessive way. This means a child inherits a changed copy of the gene from each parent.

GeneticNeurological

Also known as: lissencephaly type iii; micro-lissencephaly; type 3 lissencephaly; type iii lissencephaly

Patient organizations

Broader rare-disease groups

Source: NIH GARD · MicrolissencephalyGARD ID 16555 · 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 Microlissencephaly.

Explore the Microlissencephaly blog

Explore research for Microlissencephaly

Explore actively recruiting Microlissencephaly studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Microlissencephaly 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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