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Living with Neuronal ceroid lipofuscinosis 9

A rare type of NCL (CLN9) with poor coordination, seizures, muscle twitches, vision loss, and loss of skills.

Understanding Neuronal ceroid lipofuscinosis 9

Neuronal ceroid lipofuscinosis 9 (CLN9-NCL) is a rare condition that affects the nervous system.

Symptoms may include loss of muscle coordination (ataxia), seizures that don't respond to medicines, muscle twitches (myoclonus), vision loss, and developmental regression (loss of skills already gained).

Signs & symptoms

GARD doesn't list a detailed symptom list, but the summary describes these features:

  • Poor coordination (ataxia)
  • Seizures that don't respond to medicines
  • Muscle twitches (myoclonus)
  • Vision loss
  • Loss of skills (developmental regression)

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 genetic specialists.

  3. Ask which tests can help

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

Care & treatment

Care team
Genetic specialists (geneticists)
Expert care
Ask about multidisciplinary care centers for rare conditions
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 Children's Brain Disease 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
Is genetic testing available to look for the cause?
Which treatments can help with seizures?
Which specialists should be on my child's care team?

Quick facts

InheritanceAutosomal Recessive

The underlying gene is unknown, but it appears to be inherited in an autosomal recessive pattern, where a child inherits a changed copy of a gene from each parent.

GeneticLysosomal Storage

Also known as: cln9; neuronal ceroid lipofuscinosis type 9

Patient organizations

Source: NIH GARD · Neuronal ceroid lipofuscinosis 9GARD ID 6618 · 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 Neuronal ceroid lipofuscinosis 9.

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