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Living with Alveolar soft part sarcoma

A rare, slow-growing soft tissue cancer that often shows up as a painless lump in the legs of adults or the head and neck of children.

Understanding Alveolar soft part sarcoma

Alveolar soft part sarcoma is a rare, slow-growing soft tissue sarcoma.

It most often grows on the lower limbs in adults and in the head and neck in children, though it can occur in other places. It usually appears as a soft, painless lump, often with no other signs. Many cases aren't diagnosed until symptoms appear from spread to other sites, such as the lungs, bones, central nervous system, or liver. It can start at any time in life.

Signs & symptoms

Symptoms vary. GARD's summary says it generally shows up as:

  • A soft, painless lump

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

    Alex's Lemonade Stand Foundation, Sarcoma Alliance and Sarcoma Foundation of America may keep lists of experts for this condition.

Care & treatment

Care team
Cancer specialists (oncologists)
Expert care
Expert lists: Alex's Lemonade Stand Foundation, Sarcoma Alliance, Sarcoma Foundation of America
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 Alex's Lemonade Stand 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
Has the tumor spread to the lungs or other places?
Which tests will guide my treatment?
Which specialists should be on my care team?

Quick facts

Symptoms usually startany time in life

GARD says the underlying cause is poorly understood. Most cases occur sporadically (by chance), in people with no family history.

Also known as: adult alveolar soft part sarcoma; adult alveolar soft-part sarcoma; alveolar soft part sarcoma (disease); alveolar soft tissue sarcoma; alveolar soft-part sarcoma; asps

Patient organizations

Source: NIH GARD · Alveolar soft part sarcomaGARD ID 5654 · 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 Alveolar soft part sarcoma.

Explore the Alveolar soft part sarcoma blog

Explore research for Alveolar soft part sarcoma

Explore actively recruiting Alveolar soft part sarcoma studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Alveolar soft part sarcoma 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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