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Pre-operative embolisation before tumour surgery | CION Cancer Clinics
Pre-operative embolisation blocks the blood vessels feeding a tumour a short time before it is removed. It is used for tumours with an unusually rich blood supply, such as some kidney cancers and cancer spread to the spine, to reduce bleeding during the operation. It prepares the tumour for surgery rather than replacing it. This page explains when it is used and when it is not. 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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On this page
- Why would a tumour be embolised before surgery?
- Which tumours is it most often used for?
- What happens between the decision and the operation?
- What do families often assume about embolisation before surgery?
- What do the words in the plan mean?
- Who is it not suitable for, and what can this page not tell you?
- What should you ask before agreeing to it?
- Common questions about embolisation before surgery
The short answer
Why would a tumour be embolised before surgery?
Pre-operative embolisation blocks the blood vessels feeding a tumour a short time before it is removed. The aim is to make the operation safer by reducing bleeding, so the surgeon can see clearly and take the tumour out more completely.
Why some tumours bleed so much
Certain tumours grow a dense web of blood vessels. Kidney cancer, some thyroid cancers that have spread to bone and some tumours in the neck are well known for this. Operating on them can mean heavy blood loss, the need for a transfusion and a longer, harder operation.
Who does it and how
An interventional radiologist, a doctor who treats disease by guiding thin tubes with scans, does the embolisation. A tube is passed from an artery at the top of the leg or the wrist to the vessels feeding the tumour. Tiny particles, coils or a glue-like liquid are then used to block them. You are usually awake with sedation.
It is a step, not the treatment
Embolisation before surgery does not remove the cancer. It prepares the tumour for the operation. The surgery itself, and any treatment afterwards, is still what the plan is built around.
When it is considered
Which tumours is it most often used for?
It is not routine for most cancers. It is discussed when a tumour is known to carry an unusually rich blood supply.
Kidney cancer
Sometimes used before removing a large kidney tumour, especially when it has grown into the large vein nearby. Many kidney operations do not need it, so ask why it is being suggested.
Cancer spread to the spine or bone
Spread from kidney or thyroid cancer can be very bloody to operate on. Blocking the vessels first can make spinal surgery safer.
Often discussed for
- Spinal operations to relieve pressure on nerves
- Removing a tumour from a long bone
Tumours in the head and neck
Some tumours near the major neck vessels, such as paragangliomas, are embolised first so the surgeon can separate them from nearby nerves and arteries more safely.
Large tumours in the pelvis
Occasionally used before removing a very large tumour deep in the pelvis, where controlling bleeding during surgery is difficult.
Not sure whether this applies to you?
Ask an oncologistThe pathway
What happens between the decision and the operation?
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Scans to map the blood supply
A CT or MRI with contrast shows the size of the tumour and which arteries feed it.
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A joint plan
The surgeon and the interventional radiologist agree the timing, so the embolisation and the operation fit together. Ask who is coordinating the two dates.
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The embolisation
Done in the angiography room. The tube goes in through a small puncture and the feeding vessels are blocked while the doctor watches on an X-ray screen.
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The short gap
The operation usually follows soon afterwards, often within a few days. Waiting too long gives the tumour time to grow new vessels, which is why the dates matter.
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The operation
The surgeon removes the tumour. Less bleeding can mean a clearer view, though it does not remove every risk of surgery.
Commonly believed
What do families often assume about embolisation before surgery?
"If the tumour is embolised, maybe the operation can be skipped."
When the embolisation is done to prepare for surgery, it is not meant to replace it. The tumour usually loses some blood supply but is not destroyed. Ask the team if you are unsure what the plan depends on.
"Blocking the blood supply will make the cancer spread."
That is not what embolisation is known to do. It is used to reduce bleeding during the operation, and the operation follows closely for that reason.
"It is a small extra step, so it carries no risk."
It is less invasive than surgery, but it is still a procedure. Pain, fever and, rarely, blocking of a vessel that was not meant to be blocked can happen. Ask how the team reduces that risk.
"Every hospital does this before kidney or spine surgery."
Practice varies. Some surgeons use it often, others rarely, and studies do not all agree on who benefits. Asking why it is suggested in your case is a fair question.
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On your report
What do the words in the plan mean?
- Hypervascular
- A tumour with an unusually rich blood supply. This is the main reason embolisation is considered.
- Angiogram
- X-ray pictures of blood vessels taken while dye is injected through the tube.
- Coils
- Tiny metal springs placed in a vessel to block it.
- Devascularisation
- How much of the tumour's blood supply was successfully blocked.
- Non-target embolisation
- When particles block a vessel that was not meant to be blocked. It is uncommon, and teams take care to avoid it.
Being straight with you
Who is it not suitable for, and what can this page not tell you?
Embolisation before surgery is usually not needed when a tumour does not have an unusually rich blood supply. It may also be avoided when the artery feeding the tumour also supplies something vital, such as part of the spinal cord, and blocking it could cause more harm than the bleeding it prevents.
Other reasons it may not suit you
Severe kidney problems or a serious allergy to contrast dye can make the procedure riskier. So can problems with blood clotting. The team will check these on your blood tests and history before deciding.
What your team weighs
They balance how much bleeding they expect during the operation against the risks of the embolisation itself. That is a decision for your surgeon and interventional radiologist together.
What this page cannot tell you
It cannot tell you whether embolisation is right for your tumour, or how much it will reduce bleeding in your operation. It also cannot tell you how the surgery will go.
Take this with you
What should you ask before agreeing to it?
- Why do you expect heavy bleeding with this tumour?
- What would happen if we operated without embolisation?
- How soon after the embolisation is the operation planned?
- Who is doing the embolisation, and where?
- What side effects should we expect before the operation?
- Is the embolisation covered by my scheme or insurance?
Questions we are asked
Common questions about embolisation before surgery
Does embolisation hurt?
The puncture site is numbed, and most people feel only pressure. Afterwards, pain in the area of the tumour is common as its blood supply is cut off. Fever and feeling sick can also happen. Pain relief is given, and these usually settle as you move on to the operation.
Will I stay in hospital between the two procedures?
Often yes, because the operation usually follows closely. Some people go home for a short time if the gap allows. Your team will plan this around the operation date and how you feel after the embolisation. Ask before the day so the family can plan travel.
Can it be done at the same hospital as the surgery?
That is usually easiest, because the two teams can coordinate closely. If the embolisation is done elsewhere, ask how the images and reports will reach your surgeon, and who to call if a problem starts in between.
Does it mean I will not need a blood transfusion?
Not necessarily. It aims to reduce bleeding, and the team may still keep blood ready. Whether a transfusion is needed depends on the operation, your blood count before surgery and what the surgeon finds. Ask your surgeon about this directly.
Is it anaesthesia or sedation?
Most embolisations are done with sedation and a local anaesthetic at the puncture site. Some, especially in the head, neck or spine, may be done under general anaesthesia. The anaesthetist will explain which applies to you, and what to do about eating and drinking beforehand.
What about my blood thinners?
Tell both the surgeon and the interventional radiologist about every medicine you take, including aspirin, clopidogrel or warfarin. They will tell you what to do and when. Do not stop, start or change any medicine on your own before either procedure.
What if something goes wrong during embolisation?
Serious problems are uncommon, but they can happen. The team watches closely on screen throughout. If a problem occurs, they will explain what happened and how it changes the plan. Ask beforehand which complications they watch for in your type of tumour.
Is it covered by Aarogyasri or insurance?
When it is part of an approved surgical plan, it is often covered, but that differs by scheme and policy. Aarogyasri, CGHS, ECHS, EHS and cashless insurers each set their own rules. Call the helpline with your details so both procedures can be checked together.
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Sources
- Cancer Research UK — Treatment for kidney cancer
- NHS — Kidney cancer: treatment
- National Cancer Institute — NCI Dictionary of Cancer Terms
- American Cancer Society — Kidney cancer
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.
Keep reading
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Renal Artery Embolisation Before NephrectomyThe kidney version, in detailEmbolisation in Cancer: Cutting Off the Blood SupplyHow blocking a tumour's blood supply worksThe Days Before Your OperationWhat to prepare once the date is setMedicines Around Cancer SurgeryBlood thinners and other medicines before a procedure
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