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Living with Atypical Norrie disease due to monosomy Xp11.3

A rare condition caused by a missing piece of the X chromosome, with blindness from birth plus developmental and other differences.

Understanding Atypical Norrie disease due to monosomy Xp11.3

Atypical Norrie disease due to monosomy Xp11.3 is a rare condition caused by a missing piece of the short arm of the X chromosome.

It has classic Norrie disease features: severe retinal malformations and lens clouding that cause blindness from birth, sometimes with progressive hearing loss and intellectual disability. It also includes a small head, low muscle tone, delays in movement and growth, and behavior challenges. Features vary and can include immune problems, epilepsy, and low sex hormone function. It is noticed in newborns.

Signs & symptoms

GARD doesn't list a symptom list for this condition, but its summary describes these features:

  • Blindness from birth
  • Cloudy lenses and retina differences
  • Progressive hearing loss in some people
  • Small head and low muscle tone
  • Delayed movement and growth
  • Moderate to severe intellectual disability

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 Chromosome Disorder Outreach
  • 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 chromosome tests confirm the diagnosis?
What vision, hearing, and developmental supports are available?
Should seizures or immune health be monitored?

Quick facts

Symptoms usually startNewborn

GARD says it results from the partial deletion (missing piece) of the short arm of the X chromosome, at a spot called Xp11.3.

Genetic

Also known as: atypical norrie disease due to del(x)(p11.3); atypical norrie disease due to nullisomy xp11.3; atypical norrie disease due to xp11.3 microdeletion

Patient organizations

Broader rare-disease groups

Source: NIH GARD · Atypical Norrie disease due to monosomy Xp11.3GARD ID 20782 · 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 Atypical Norrie disease due to monosomy Xp11.3.

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  • Eligibility is confirmed by the study team

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