Sarcoma (bone and soft-tissue cancer)

An uncommon group of cancers that begin in bone or in the soft tissue of the body. Most lumps are not sarcoma — and where one might be, the order in which the tests are done matters.

What it is

Sarcoma is the name for cancers that begin in the body's connective tissue — the tissue that holds everything else in place. Soft-tissue sarcomas start in muscle, fat, the sheath around a nerve, a blood vessel, or the fibrous tissue between them, and they can appear anywhere: an arm, a leg, the trunk, or the back of the abdomen. Bone sarcomas start in bone itself, and are the ones seen more often in teenagers and young adults. This is a family of diseases rather than one disease. There are many types, each named from what the tissue looks like under the microscope, and the type is what decides the plan — which is why naming it exactly is worth the days it takes. Sarcomas are uncommon, and that fact cuts both ways: most lumps and most aching bones are something else entirely, and where a sarcoma is possible, the first few tests are best planned by a team that treats these, because the order they are done in changes what the operation afterwards can be.

Two of the practice's cancer surgeons standing together in the outpatient corridor.

Worth getting checked

A doctor should look at any of these if they last longer than two weeks:

A lump anywhere in the body that is getting bigger
A lump larger than a golf ball, or one that feels deep and fixed rather than soft and movable under the skin
A lump that has started to hurt after being painless
A lump that has grown back where one was removed before
Bone pain that is there at night or at rest, rather than only when you use the limb
Swelling over a bone, or a limp with no injury to explain it
A bone that breaks after a knock too small to explain it

Most lumps under the skin are not sarcoma. A lipoma, a cyst or a swollen gland is far more common, and a doctor can often tell a good deal from examining one. The list above is not a list of likely things — it is the short list of features that are worth showing to someone now rather than watching for another six months.

How we find out

A clinical examination.
The doctor asks how long the lump has been there and whether it has changed, then feels how large it is, how deep it sits, and whether it moves. Size, depth and growth are the three things that decide whether anything further is needed at all — and for most lumps, nothing further is.
A scan, before any needle.
For a soft-tissue lump in a limb or the trunk, an MRI is the scan that answers the question: it shows what the lump is made of, how deep it sits, and what runs beside it. For bone, an X-ray comes first and an MRI follows. The scan is done before a biopsy rather than after, both because a needle changes the picture and because the scan is what tells the team where the biopsy should go in.
A planned biopsy.
A needle takes a small core of tissue, usually with a scan guiding it, under local anaesthetic. Where the needle goes in matters as much as what it brings back: the track it leaves has to be removed along with the tumour at the operation, so it is planned by the team that would do that operation. three to five working days for the report.
Naming the type exactly.
Because sarcomas are uncommon and there are many types, the sample often goes for a specialist pathology opinion, and further tests are run on the same tissue before the type is settled. That adds to the wait — up to about ten working days on top of the first report here, against 24 to 48 hours for reports generally. It is worth it. The type is what decides whether chemotherapy belongs in your plan at all.
Scans of the rest of the body.
A CT of the chest is done, because when a sarcoma travels it usually travels to the lungs. Other scans are added where the type calls for them. This determines the stage, which determines the treatment.

A biopsy does not spread cancer. This is one of the most common fears we hear, and it is not true. What does matter is where the biopsy is taken and by whom — which is why, for a lump that might be a sarcoma, it is planned by the team that would operate rather than done wherever it can be fitted in soonest.

How it is treated here

Surgery.: For most sarcomas this is the main treatment. The tumour is removed in one piece, together with a margin of normal tissue around it and with the old biopsy track. Getting that margin right at the first operation is the part that matters most, and it is the reason so much of the planning happens before the day of surgery. Where the tumour lies against a nerve, a blood vessel or a bone, the operation is planned around what has to be kept.
Radiation therapy.: Often part of the plan for soft-tissue sarcoma, given with a Varian Halcyon linear accelerator. Before surgery it can make the tumour easier to remove cleanly; after surgery it treats the tissue around where the tumour was. Which way round it goes is settled before anything starts.
Chemotherapy.: Its place depends entirely on the type. For some bone sarcomas it is standard, and is given before the operation as well as after it. For many soft-tissue sarcomas it is not part of the plan at all. This is one of the largest differences between the types, and it is why the pathology report is worth waiting for.
Targeted treatment.: A few sarcoma types carry a specific change in the tumour that a targeted drug is directed at. That is decided from tests on the tissue, not from the diagnosis alone.
Repairing what the operation leaves behind.: Where removing the tumour leaves a gap in soft tissue or in bone, how that gap is closed or rebuilt is planned in the same sitting rather than left until afterwards. For sarcomas of an arm or a leg, keeping the limb and keeping it working is what the operation is planned around wherever that is possible.

Your combination is decided by the tumour board, not by one doctor alone. With sarcoma that discussion settles the order as well — for several types, what is done before the operation changes the operation itself.

What day-to-day life looks like

Honest expectations: after an operation on an arm or a leg, movement and strength come back slowly, and the physiotherapy you are given is part of the treatment rather than an extra on top of it — start it on the day you are told to, and keep going after the soreness has settled. If radiation is given before surgery, the wound is slower to heal afterwards and is watched more closely for a few weeks; that is expected, not a setback. Tiredness through chemotherapy builds over the cycles rather than arriving on the first day, and it lifts over the weeks after the course ends. Sarcoma is one of the cancers that turns up in young people, so two conversations are worth having early: if chemotherapy is part of your plan and you may want children later, say so before it starts rather than after; and if you are studying or in your first years of work, tell your doctor, because the timetable can often be arranged around what you cannot move. Most patients continue living at home and come in for sessions. Recovery needs support as well as an operation — with eating, with speech, with movement, and with getting back to ordinary days. Ask your surgeon what yours will need and who can help with it.

Questions we hear every week

I have had a lump for years. Should I be worried?

Usually not. A lump that has stayed the same size for years, feels soft, sits just under the skin and moves when you push it is most often something ordinary, like a lipoma. It is the lump that is growing, that is bigger than a golf ball, that feels deep and fixed, or that has started to hurt, which is worth a scan.

Can the lump just be removed, and tested afterwards?

Where a sarcoma is possible, it is better not to. A lump taken out without a scan and a plan is usually removed without the margin around it, and then a second and larger operation is needed to clear the ground the first one passed through. A scan first, then a planned biopsy, then one properly planned operation is fewer operations, not more.

Does a biopsy spread cancer?

No. This is a common belief and it is not correct.

Did an injury cause this?

No. Many people first notice a lump just after a knock to that area, simply because that is when they touched it. The injury did not cause it. A swelling that appears after an injury and then does not settle within a few weeks is worth showing to a doctor.

Why is the report taking so long?

Because sarcomas are uncommon and there are many types. The tissue often goes for a specialist pathology opinion, and further tests are run on the same sample before the type can be named. three to five working days covers the first report, and a specialist opinion adds up to about ten working days. That name is what decides the treatment, so it is worth getting exactly right. If you have heard nothing by the date you were given, call and ask where your report has reached.

Will I lose my arm or my leg?

Keeping the limb, and keeping it useful, is what the operation is planned around, and for many sarcomas of an arm or a leg that is possible. What decides it is where the tumour sits and what it is touching. Where keeping the limb is not the right operation, your surgeon will tell you so plainly, and explain why, before you consent to anything.

Have a report or a symptom you are unsure about?

Bring it in. If it is nothing, we will tell you it is nothing.

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Medically reviewed by The surgical oncology team, Saurashtra Cancer Care, MCh / DNB Surgical Oncology · August 2026