Soft tissue sarcoma

Also called Sarcoma

Soft tissue sarcoma is a rare type of cancer that develops in the soft tissues of the body, such as muscle, fat, nerves, tendons and blood vessels. It can happen anywhere but is most common in the arms, legs and tummy. It often first shows as a painless lump that gets bigger. There are many different types.

Last updated Nov 9, 2026

What it is

Treatment is planned by a specialist sarcoma team and usually includes surgery to remove the tumour, often with radiotherapy and sometimes chemotherapy.

Regular follow-up scans are needed after treatment.

Common signs

  • A lump that is getting bigger
  • A lump larger than 5cm
  • A lump deep in the muscle
  • Pain or swelling
  • Tummy pain or a feeling of fullness if in the tummy

How it is usually diagnosed

  • Ultrasound and MRI scans
  • A biopsy
  • CT or PET scans to check for spread

Records worth keeping

Keeping these together makes each appointment easier, especially when you see a new doctor:

  • Scan reports
  • Biopsy and pathology reports
  • Sarcoma team letters
  • Treatment plans and follow-up schedule

Questions to ask your doctor

  • What type and grade of sarcoma is it?
  • What treatment do you recommend?
  • How often will I need scans afterwards?

When to get help right away

Call 112 or go to the nearest emergency department if you have:

  • A lump that is growing quickly, or is larger than a golf ball: see a GP soon and ask about an urgent referral

This page is general information. It is not a diagnosis and does not replace a doctor who knows your history. Medfold keeps your records organised; it does not interpret them.

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