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Living with Hemihypertrophy of lower limb

A rare genetic condition where one or both legs grow longer or wider than normal.

Understanding Hemihypertrophy of lower limb

Hemihypertrophy of the lower limb is a rare genetic condition that causes overgrowth of the bones or soft tissues of one or both legs.

The leg can be longer, wider, or both. The growth may involve the whole limb or only the upper or lower part. It can be mild with no trouble moving, or the leg can be very enlarged with stiff knee and ankle. Some people have blood vessel differences such as varicose veins, and muscle pain.

Signs & symptoms

Symptoms vary from person to person. Based on the summary, they can include:

  • Overgrowth of one or both legs
  • A longer or wider leg
  • Stiff knee or ankle in more severe cases
  • Varicose veins
  • Muscle pain (myalgia)

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
Is genetic testing available to find the cause in our case?
How should leg length and growth be monitored?
Which specialists should we see for bones and blood vessels?

Quick facts

GARD says changes in genes (also called variants) cause this condition.

Genetic

Also known as: congenital overgrowth of lower limb; lower limb hypertrophy; overgrowth of one leg

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Hemihypertrophy of lower limbGARD ID 21213 · 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 Hemihypertrophy of lower limb.

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Explore research for Hemihypertrophy of lower limb

Explore actively recruiting Hemihypertrophy of lower limb studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Hemihypertrophy of lower limb 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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