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Living with Lissencephaly with cerebellar hypoplasia type B

A form of lissencephaly with a slightly small head, low muscle tone, delayed development, and hippocampus differences.

Understanding Lissencephaly with cerebellar hypoplasia type B

Lissencephaly with cerebellar hypoplasia type B is a form of lissencephaly with a small cerebellum, low muscle tone, and delayed development.

It involves a slightly small head, low muscle tone (hypotonia), and delays in nervous system and thinking development. A hippocampal malformation, a difference in the memory-related part of the brain, is a characteristic finding on imaging. It may be noticed during pregnancy, at birth, or in infancy.

Signs & symptoms

GARD doesn't list a symptom list for this condition. Its summary describes these features:

  • Slightly small head (microcephaly)
  • Low muscle tone (hypotonia)
  • Delayed neurological development
  • Delayed thinking development
  • Hippocampal malformation on imaging

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 Child Neurology Foundation 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?
Which therapies can help with muscle tone and development?
What do the brain imaging findings mean for my child?

Quick facts

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

GARD doesn't describe a cause for this condition yet.

GeneticNeurological

Also known as: lissencephaly co-occurrent with congenital cerebellar hypoplasia type b

Patient organizations

Source: NIH GARD · Lissencephaly with cerebellar hypoplasia type BGARD ID 19732 · 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 Lissencephaly with cerebellar hypoplasia type B.

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Explore research for Lissencephaly with cerebellar hypoplasia type B

Explore actively recruiting Lissencephaly with cerebellar hypoplasia type B studies with HealthSpark.

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  • Recruiting studies from ClinicalTrials.gov
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  • Eligibility is confirmed by the study team

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