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Living with Carpotarsal osteochondromatosis

A very rare bone condition that causes extra bone growth and bony lumps in the arms and legs.

Understanding Carpotarsal osteochondromatosis

Carpotarsal osteochondromatosis is a very rare primary bone disorder (bone dysplasia) with extra bone growth and osteochondromas in the arms and legs.

Osteochondromas are bony growths that are covered with cartilage. GARD says this condition usually shows up in adults.

Signs & symptoms

GARD doesn't list specific symptoms for this condition yet. Its summary describes these features:

  • Extra bone growth
  • Bony growths (osteochondromas) in the arms
  • Bony growths (osteochondromas) in the legs

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 bones are affected, and do the growths need treatment?
How should the growths be monitored?
Could genetic counseling help my family?

Quick facts

Symptoms usually startAdult
InheritanceAutosomal Dominant

GARD says changes in genes cause this condition. It is inherited in an autosomal dominant way, so one changed copy of a gene can cause it. No specific gene is listed.

Genetic

Also known as: dysplasia epiphysealis hemimelica with chondromas and osteochondromas; maroteaux le-merrer bensahel syndrome; maroteaux-le merrer-bensahel syndrome

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Carpotarsal osteochondromatosisGARD ID 1128 · 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 Carpotarsal osteochondromatosis.

Explore the Carpotarsal osteochondromatosis blog

Explore research for Carpotarsal osteochondromatosis

Explore actively recruiting Carpotarsal osteochondromatosis studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Carpotarsal osteochondromatosis 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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