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Cryoablation: how freezing a tumour works | CION Cancer Clinics
Cryoablation destroys a tumour by freezing it through thin needles placed inside it, guided by a CT or ultrasound scan. Ice forms around the needle tips, breaks the cancer cells apart and cuts off their blood supply, and nothing is cut out. It is used most for small kidney tumours and painful bone deposits. It does not suit large or widespread cancer, and bleeding is the risk watched most closely. CION Cancer Clinics’ surgical oncologists in Hyderabad can talk this through with you.
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Medically reviewed by Dr. Muralidhar MuddusettyConsultant Surgical Oncologist · MBBS (AIIMS), MS (Surgery, AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh) · last reviewed September 2026, next review due September 2027
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The short answer
How does freezing destroy a tumour?
Cryoablation kills a tumour by freezing it through thin needles, called cryoprobes, placed inside it. Ice crystals form inside and around the cells, tearing them apart, and the tumour is left in place to scar.
Why freezing and thawing both matter
The freezing forms ice that damages cell walls. Letting the tissue thaw and then freezing it again does even more harm, because thawing cells swell and burst. The cold also damages the small blood vessels feeding the tumour, so any cells that survive the ice lose their blood supply.
The ice ball you can see
As the tissue freezes, an ice ball forms around the probe tips. It shows up clearly on CT and ultrasound. This lets the doctor watch, in real time, whether the ice has covered the whole tumour with a rim of normal tissue. Heat ablation does not give such a clear picture while it is happening.
Why it can be gentler nearby
Cold tends to spare the tough framework of nerves and larger tissues better than heat does. Many people also report less pain during and after freezing than after heating, though every case is different.
What it cannot do
Like every kind of ablation, it treats only the tumour the probes are placed in. It does nothing for cancer elsewhere in the body, and it does not give a new tissue sample for the laboratory. So a biopsy is often taken first, or at the start of the same procedure.
Where it is used
Which tumours is cryoablation used for?
Freezing is chosen where seeing the edge clearly, or protecting nearby nerves, matters most.
Kidney
Small kidney tumours are one of the most common uses. It is often weighed against removing part of the kidney, especially in older people or those with weaker kidneys.
Bone and soft tissue
Painful cancer deposits in bone, and some tumours in muscle or under the skin. The aim is often easing pain.
Also sometimes used for
- Desmoid tumours
- Deposits near the spine
Prostate
Offered in some centres for cancer confined to the prostate, or after radiotherapy has not worked. Evidence is more limited than for surgery or radiotherapy.
Lung and breast
Small lung tumours in people unfit for surgery. In the breast, it is still mostly studied in trials for small tumours.
Not sure whether this applies to you?
Ask an oncologistOn the day
What happens during cryoablation?
Preparing you
You will be asked not to eat for some hours beforehand. A cannula goes into a vein, and you have sedation or a general anaesthetic, depending on the site.
Placing the probes
Guided by CT or ultrasound, the doctor passes one or several thin probes through small nicks in the skin. More probes are used for larger tumours to make one joined-up ice ball.
Freeze, thaw, freeze
Very cold gas flows into the probes and the ice ball grows. The tissue is allowed to thaw, then frozen again. Scans are taken throughout to watch the edge of the ice.
Removing the probes
The probes are warmed so they can be withdrawn. Pressure is held on the skin, small dressings go on, and a final scan checks for bleeding.
On your report
What do the terms in a cryoablation report mean?
- Cryoprobe
- The thin needle that carries the cold gas into the tumour.
- Ice ball
- The frozen area seen on the scan during the procedure. The deadly cold zone sits a little inside its visible edge, so it must go beyond the tumour.
- Freeze-thaw cycle
- One round of freezing followed by thawing. The report may say how many rounds were done.
- Perinephric haematoma
- A collection of blood around the kidney after the procedure. Small ones usually settle on their own.
- Hydrodissection
- Fluid injected to push a nearby organ, such as the bowel, away from the ice so it is not harmed.
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Did you know
Freezing has been used for a long time to treat skin problems such as warts. Cryoablation uses the same idea deep inside the body, with scans showing exactly where the ice is going. The tools are very different, but the principle of cold killing cells is the same.
Being straight with you
Who is cryoablation not suitable for?
It does not suit large tumours, many tumours, or cancer that has spread widely. A tumour pressed against the bowel or the ureter, the tube that drains the kidney, may be too close unless it can be moved safely away.
Bleeding is the risk to think about
Freezing does not seal small blood vessels the way heat does, so bleeding after cryoablation is watched for closely. This matters if your blood does not clot well. Tell the team about blood thinners such as aspirin, clopidogrel or warfarin. They will decide whether and when to pause them. Never stop a medicine on your own.
What this page cannot tell you
It cannot say whether freezing is right for your tumour, or how you will do afterwards. It cannot say which centres have the equipment either, so ask them directly. Your treating team weighs your scans, biopsy and general health before advising.
Questions worth asking
Why freezing rather than heat, surgery or radiotherapy? How often does this team freeze tumours in your organ? Will you stay overnight? Which signs at home mean you should come back straight away? When is the first check scan? Bring a family member to write the answers down.
Commonly believed
What do people often get wrong about freezing a tumour?
"Cold only slows the cancer down, like a fridge."
Cryoablation goes far colder than any fridge. The ice breaks cells apart, and repeated freezing and thawing destroys them. It is meant to kill the tumour, not keep it quiet.
"Freezing is always safer than heat."
It can spare nerves better and may hurt less, but it carries a greater risk of bleeding. Each method has its own risks, and the team matches them to your tumour and your health.
"The ice melts and the tumour comes back to life."
Cells killed by the ice do not recover when it melts. Tumour can grow back at the edge if the ice did not fully cover it, which is why check scans follow.
"Cryoablation for the prostate is the same as for the kidney."
The idea is the same, but the evidence, the side effects and who it suits are different in each organ. Ask about the results for your own organ, not ablation in general.
Questions we are asked
Common questions about cryoablation
Does cryoablation hurt?
You have sedation or a general anaesthetic, so the freezing itself should not be felt. Afterwards there is usually some ache where the probes went in. Many people find it less sore than after heat ablation, but pain varies. Tell the team if it keeps getting worse rather than better.
Will I be in hospital overnight?
Many people go home the same day or the next morning. Kidney cryoablation often means an overnight stay to watch for bleeding. A longer stay may be needed after lung treatment or if you have other health problems. Ask the centre what to plan for.
Is cryoablation the same as cryotherapy?
The words overlap. Cryotherapy often means freezing on the surface, such as for skin spots or early changes on the cervix. Cryoablation usually means freezing a tumour deep inside the body through needles guided by a scan. Ask your doctor which one they mean.
What side effects should I expect?
Soreness, bruising and tiredness are common. Some people have a mild fever and aches for a few days. After kidney treatment there may be a little blood in the urine at first. Heavy bleeding, severe pain, or a high fever with shivering needs a call to the team that day.
Can I have cryoablation if I take blood thinners?
Often yes, but it needs planning because freezing carries a bleeding risk. Tell the team about every medicine, including aspirin, clopidogrel and warfarin. They will decide with your prescribing doctor whether and when to pause each one. Do not stop any medicine on your own.
Can it be repeated?
Often, yes. If a check scan shows living tumour at the edge, or a new small tumour appears, freezing again is one option. Surgery or another kind of ablation may be discussed instead. Your team decides based on the size and position of what they find.
How will we know if it worked?
A scan some weeks later looks for any living tumour at the edge of the frozen area. The treated area usually shrinks slowly over many months but does not vanish. Scans then continue at intervals your team sets. Ask them to explain each report with you.
Is cryoablation covered by Aarogyasri or insurance?
Cover depends on the scheme, the package and the centre. Aarogyasri, CGHS, ECHS, EHS and cashless insurance may each treat it differently, and the probes are often a separate cost. Ask the centre to check your card or policy against the planned procedure before the date is fixed.
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Sources
- National Cancer Institute — Definition of cryoablation
- Cancer.Net — Kidney Cancer: Types of Treatment
- NHS — Kidney cancer: treatment
- American Cancer Society — Cancer types
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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