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Living with Acropectoral syndrome

A rare genetic condition with webbed fingers and toes, extra thumbs or toes, and a differently shaped upper breastbone.

Understanding Acropectoral syndrome

Acropectoral syndrome is a rare syndrome with hand and foot differences and an upper breastbone difference.

People have webbed fingers and toes (syndactyly) and extra thumbs or big toes (preaxial polydactyly). The upper sternum is also differently shaped. GARD lists onset as the newborn and infant period.

Signs & symptoms

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

  • Webbed fingers
  • Extra thumb (preaxial polydactyly)
  • Chest shape differences (upper sternum)

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 bone and joint 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
Bone and joint specialists (orthopedists or orthopedic surgeons); 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 rare disease patient organizations for support
  • 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 surgeons should evaluate the hands and feet?
Does the chest difference affect breathing or the heart?
What does genetic counseling say about inheritance?

Quick facts

Symptoms usually startNewborn and as an Infant
InheritanceAutosomal Dominant

GARD says changes in genes (also called variants) cause this condition. It is autosomal dominant, so one changed copy of the gene is enough.

Genetic

Also known as: acro-pectoral syndrome; acrp syndrome; acrps; dundar acropectoral syndrome; syndactyly with preaxial polydactyly and sternal deformity syndrome; syndactyly-preaxial polydactyly-sternal deformity syndrome

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Acropectoral syndromeGARD ID 8485 · 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 Acropectoral syndrome.

Explore the Acropectoral syndrome blog

Explore research for Acropectoral syndrome

Explore actively recruiting Acropectoral syndrome studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Acropectoral syndrome 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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