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Living with Segmental progressive overgrowth syndrome with fibroadipose hyperplasia

A rare genetic overgrowth condition in which parts of the body, often the legs, grow larger from extra fat and fibrous tissue.

Understanding Segmental progressive overgrowth syndrome with fibroadipose hyperplasia

Segmental progressive overgrowth syndrome with fibroadipose hyperplasia is a rare PIK3CA-related overgrowth condition.

Overgrowth is segmental and progressive, mostly in fat tissue or a mix of fat and fibrous tissue. Muscle and bone can be involved. It is often uneven and affects the legs more than the arms. It usually starts before or at birth.

Signs & symptoms

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

  • Overgrowth of a body part
  • Extra fat tissue
  • Fatty lumps (lipomas)
  • Bone overgrowth
  • Skin blood vessel marks (capillary malformation)
  • Loss of fat in some spots (lipoatrophy)

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 and hormone specialists.

  3. Consider genetic testing

    Changes in PIK3CA are linked to this condition. Genetic testing and counseling can help confirm a diagnosis and explain what it means for your family.

  4. Connect with expert centers

    CLOVES Syndrome Community may keep lists of experts for this condition.

Care & treatment

Care team
Genetic specialists (geneticists); Hormone specialists (endocrinologists)
Expert care
Expert lists: CLOVES Syndrome Community
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 CLOVES Syndrome Community and other patient organizations
  • 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
Should we have genetic testing for the PIK3CA gene?
How will growth be monitored?
Are there treatment options being studied for PIK3CA-related overgrowth?

Quick facts

Symptoms usually startduring Pregnancy and as a Newborn
GenesPIK3CA

It is caused by changes in the PIK3CA gene. GARD does not list an inheritance pattern.

GeneticEndocrine

Patient organizations

Source: NIH GARD · Segmental progressive overgrowth syndrome with fibroadipose hyperplasiaGARD ID 21384 · 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 Segmental progressive overgrowth syndrome with fibroadipose hyperplasia.

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