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Living with Distal monosomy 13q

A rare chromosome condition with wide-ranging effects on learning, the brain, eyes, and face.

Understanding Distal monosomy 13q

Distal monosomy 13q is a rare condition caused by a missing piece of the long arm of chromosome 13.

Effects vary a great deal from person to person. People often have some level of intellectual disability and developmental delay. Differences in the brain's structure, eye differences, and facial features such as a small head and small lower jaw can occur. Heart, kidney and urinary, digestive, and bone differences have also been reported. Signs can begin during pregnancy, at birth, or in infancy.

Signs & symptoms

GARD doesn't list common symptoms for this condition, but the summary describes these features:

  • Intellectual disability
  • Delays in development
  • Differences in brain structure
  • Eye differences
  • Small head and small lower jaw
  • Heart, digestive, or kidney differences

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 digestive system specialists, eye disease specialists and 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
Digestive system specialists (gastroenterologists); Eye disease specialists (ophthalmologists); 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 tests would show how my child's brain, heart, and kidneys are affected?
Which eye specialists should see my child?
How can we plan early support for development?

Quick facts

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

GARD says changes in a person's genes cause this condition. The summary describes it as a partial loss of the long arm of chromosome 13.

GeneticGastrointestinal

Also known as: 13q32 deletion; anal atresia, hypospadias, and penoscrotal inversion; deletion 13q32; distal 13q deletion; distal monosomy type 13q; monosomy 13q32

Patient organizations

Broader rare-disease groups

Source: NIH GARD · Distal monosomy 13qGARD ID 16571 · 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 Distal monosomy 13q.

Explore the Distal monosomy 13q blog

Explore research for Distal monosomy 13q

Explore actively recruiting Distal monosomy 13q studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Distal monosomy 13q 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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