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Living with Desmoid tumor

A noncancerous but sometimes aggressive growth of connective tissue that can invade nearby tissue and return after removal.

Understanding Desmoid tumor

A desmoid tumor is an abnormal growth that arises from connective tissue, the tissue that gives strength and flexibility to bones, ligaments, and muscles.

Most people develop a single tumor. They most often appear in the 30s or 40s but can occur from adolescence to late adulthood. Desmoid tumors are generally noncancerous because they do not spread, but they can invade nearby tissue, be hard to remove, and come back.

Signs & symptoms

Symptoms vary by where the tumor is. GARD lists these among the most common:

  • A firm lump under the skin
  • Abdominal pain
  • Changes in the abdominal wall
  • Poor absorption of nutrients (malabsorption)
  • Growths in the intestine (polyposis)
  • Fibrous tumors (fibromas)

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 cancer specialists.

  3. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

  4. Connect with expert centers

    Children's Tumor Foundation and Desmoid Tumor Research Foundation may keep lists of experts for this condition.

Care & treatment

Care team
Cancer specialists (oncologists)
Expert care
Expert lists: Children's Tumor Foundation, Desmoid Tumor Research Foundation
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 Children's Tumor Foundation 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
Where is my tumor, and is it growing?
What are the options besides surgery?
Does a family history change my care or testing?

Quick facts

Symptoms usually startTeenager and as an Adult
InheritanceAutosomal Dominant

GARD doesn't name a gene. It lists autosomal dominant inheritance, so a changed copy of the gene from one parent can be enough.

Also known as: aggressive fibromatosis; deep fibromatosis; deep fibromatosis/desmoid tumor; deep fibromatosis/desmoid tumour; desmoid; desmoid fibromatosis

Patient organizations

Source: NIH GARD · Desmoid tumorGARD ID 1820 · 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 Desmoid tumor.

Explore the Desmoid tumor blog

Explore research for Desmoid tumor

Explore actively recruiting Desmoid tumor studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Desmoid tumor 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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