Hematologist
CION Cancer Clinics
Solitary plasmacytoma: tests, radiotherapy and follow-up | CION Cancer Clinics
A solitary plasmacytoma is usually treated with radiotherapy aimed at the single lump, and for many people nothing more is needed. Before that, a biopsy, a bone marrow test and whole-body scans must show there is no myeloma elsewhere. Surgery helps when a bone is broken or weak. Regular blood tests and scans afterwards matter, because some people develop myeloma later. At CION Cancer Clinics, every leukaemia, MDS and MPN case is reviewed by our haematologist and discussed at a tumour board before a plan is agreed.
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Medically reviewed by Dr. Basudev PokhrelConsultant Haematologist · last reviewed September 2026, next review due September 2027
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On this page
- What is a solitary plasmacytoma, and how is it treated?
- How do doctors check that it really is only one?
- Which treatments are used, and who are they for?
- What do the words on the report mean?
- What do families often get wrong about plasmacytoma?
- What happens after radiotherapy, and what can this page not tell you?
- Common questions about solitary plasmacytoma
The short answer
What is a solitary plasmacytoma, and how is it treated?
A solitary plasmacytoma is a single lump made of abnormal plasma cells, with no sign of myeloma anywhere else in the body. The main treatment is a course of radiotherapy aimed only at that one lump, and for many people that is the whole of the treatment.
Plasma cells, and why they matter here
Plasma cells are white cells that make antibodies to fight infection. In a plasmacytoma, one faulty plasma cell copies itself again and again until the copies form a lump. When many of these lumps appear, or the faulty cells fill the bone marrow, the illness is called multiple myeloma. The word "solitary" is the doctor's way of saying there is only one.
Two kinds, depending on where it grows
Most grow inside a bone, often in the spine, a rib or the pelvis. This is a solitary bone plasmacytoma. Fewer grow in soft tissue outside the bone, commonly in the nose, sinuses or throat. This is called extramedullary, which simply means "outside the marrow". The two behave a little differently, and your haematologist will tell you which one your report describes.
"Solitary" is a finding that has to be proved with tests. Treatment is planned only after those tests are complete.
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One thing that cannot wait
A plasmacytoma in the spine can press on the spinal cord. If there is new weakness in the legs, numbness around the groin or buttocks, or sudden trouble passing urine or controlling the bowels, go to the nearest emergency department the same day, or call 108. Tell them a spinal plasmacytoma has been found. Do not wait for your next clinic appointment.
Not sure whether this applies to you?
Ask an oncologistBefore treatment
How do doctors check that it really is only one?
These tests decide whether you are treated for a single lump or for myeloma. They usually take a few weeks to complete.
A biopsy of the lump
A small piece of the lump is taken and looked at under the microscope. Special stains show whether the cells are all copies of one plasma cell.
A bone marrow test
A sample is taken from the back of the hip bone. In a true solitary plasmacytoma, the marrow shows no clear build-up of the faulty cells.
Whole-body scanning
A PET-CT or a whole-body MRI looks for other lumps or damaged areas of bone that an X-ray would miss.
Blood and urine tests
These check calcium, kidney function, haemoglobin and the abnormal protein that plasma cells can release into the blood.
Treatment
Which treatments are used, and who are they for?
Most people need only one of these. The choice depends on where the lump is, how big it is and whether the bone has been weakened.
Radiotherapy
This is the standard first treatment. It is given as short daily sessions on weekdays over several weeks, aimed only at the lump and a margin of tissue around it. Tiredness and soreness of the skin in the treated area are the common side effects.
Surgery
Surgery is not usually the main treatment. It is used when a bone has broken or is close to breaking, or when the spine needs support. It is sometimes used to remove a small lump in soft tissue.
Radiotherapy is often still given after surgery.Myeloma medicines
These are not routine for a single lump. They may be discussed when the lump does not respond, when the risk of myeloma looks higher, or when myeloma develops later.
Not suited to
- A lump fully treated by radiotherapy alone
- Anyone whose tests are not yet complete
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On your report
What do the words on the report mean?
- Paraprotein or M-protein
- An abnormal antibody made by the faulty plasma cells. Its level is watched to see whether treatment worked.
- Serum free light chains
- Small pieces of antibody measured in the blood. An unbalanced ratio can point to faulty plasma cells.
- Clonal plasma cells
- Plasma cells that are all copies of one cell. This is what makes the lump a plasmacytoma.
- CRAB features
- High calcium, kidney damage, low haemoglobin and bone damage. Their absence supports a solitary diagnosis.
- Extramedullary
- Growing outside the bone marrow, usually in soft tissue.
Commonly believed
What do families often get wrong about plasmacytoma?
"It is the same as multiple myeloma."
It is related, but it is not the same. A solitary plasmacytoma is limited to one place and is treated locally. Myeloma affects the marrow across the body and needs medicines given throughout the body.
"Once the lump is gone, we can stop the check-ups."
Regular blood tests and scans are an important part of the treatment. Some people go on to develop myeloma years later, and finding it early gives more choices.
"Radiotherapy will make the whole body radioactive."
External radiotherapy leaves nothing behind in the body. You can be close to children and older relatives the same day.
"Back pain at our age is normal, so we can wait."
Back pain that is new, keeps getting worse or wakes you at night deserves a proper check, especially after a plasmacytoma.
After treatment
What happens after radiotherapy, and what can this page not tell you?
After radiotherapy, you will have blood tests every few months at first, then less often. Scans are repeated to check the treated area and to look for new ones. The abnormal protein, if your cells made one, often falls slowly over many months, so one result on its own does not tell the whole story.
What to bring to each visit
Bring every earlier report, including the first biopsy and the radiotherapy summary. Write down any new pain, lumps, infections or tiredness since the last visit, with the dates. If a son or daughter helps with decisions, bring them along, because the follow-up plan runs for years.
The risk of myeloma later
Some people stay well after treatment for a long time. Others develop myeloma, sometimes years later. A lump in the bone carries a higher chance of this than a lump in soft tissue. Your haematologist looks at your own tests, including the protein level after treatment, to explain your own picture.
What this page cannot tell you
This page cannot tell you how your lump will respond or what your own outlook is. Those answers depend on your scans, marrow results and how the protein level changes. At CION, the haematology team reviews every case at a tumour board and coordinates any care that is needed with qualified centres.
Questions we are asked
Common questions about solitary plasmacytoma
Is a solitary plasmacytoma a cancer?
Yes. It is a cancer of plasma cells, which belong to the blood and immune system. But it is limited to one place, which is why it is treated with local radiotherapy rather than with medicines given across the body. It is looked after by a haematologist or an oncologist, often working together.
Will I need chemotherapy?
Most people with a true solitary plasmacytoma do not. Radiotherapy is the usual treatment. Medicines are considered if the lump does not respond, if tests suggest a higher risk, or if myeloma develops later. Your haematologist will explain why they are or are not being suggested for you.
Does radiotherapy for a plasmacytoma hurt?
The sessions themselves are not felt. You lie still for a few minutes while the machine works. Discomfort can come from the skin in the treated area or from the lump itself. If the lump is in the throat or sinuses, swallowing may become sore for a while. Tell the team early, as it is easier to manage.
Can I keep working during treatment?
Many people can, especially in the first weeks. Tiredness tends to build up towards the end of the course. Heavy lifting may need to stop for a while if the lump has weakened a bone in the spine or pelvis. Ask your team what is safe for your own job.
How often will I need follow-up tests?
Usually every few months in the early years, then less often if all remains stable. Each visit normally includes blood tests for the abnormal protein, kidney function and blood counts. Scans are repeated when your team feels they are needed. Keep all your reports together in one file.
Can a plasmacytoma come back?
It can come back in the same place, appear somewhere new, or turn into myeloma. This is why follow-up matters. If you notice new bone pain, a new lump, unusual tiredness or frequent infections, tell your team rather than waiting for the next visit.
Is a stem cell transplant needed?
Not for a single lump treated with radiotherapy. A transplant may be discussed only if myeloma develops later. CION's haematology team does not perform transplants but can assess whether one is worth considering and coordinate a referral to a qualified centre.
Is treatment covered by Aarogyasri or insurance?
Radiotherapy for a confirmed cancer is often covered under Aarogyasri, PM-JAY, CGHS, ECHS, EHS or cashless insurance. Scheme rules change, so check the current rules for your card. Call the helpline with your details and we will help you check your cover before treatment begins.
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Dr. Basudev Pokhrel reviews blood counts, transfusion needs and blood disorders, and works with the CION tumour board on blood cancers.
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Sources
- National Cancer Institute — Plasma Cell Neoplasms (Including Multiple Myeloma) Treatment (PDQ) - Patient Version
- Cancer Research UK — Myeloma
- NHS — Multiple myeloma
- Leukemia & Lymphoma Society — Myeloma
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
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Have a biopsy or scan report that mentions plasmacytoma?
Share it with us. CION's haematology team will go through the tests done so far, tell you what is still needed, and help you plan the next step. One helpline serves every CION centre.