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Separation surgery before spine radiosurgery | CION Cancer Clinics
Separation surgery removes just enough tumour to leave a small gap around the spinal cord, and usually steadies the spine with screws and rods. That gap lets spine radiosurgery, also called SBRT, give a strong, precise dose to the rest of the tumour while keeping the cord safe. This page explains how the two fit together, who it suits and the risks. CION Cancer Clinics’ surgical oncologists in Hyderabad can talk this through with you.
MI
Medically reviewed by Dr. Mohammed ImaduddinConsultant Surgical Oncologist · MBBS, MS (General Surgery), MCh (Surgical Oncology) · last reviewed September 2026, next review due September 2027
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On this page
- What is separation surgery?
- What does the surgeon actually do?
- What happens between the MRI and the radiosurgery?
- What do the words in the letters and reports mean?
- What are the risks, and what does the team weigh up?
- What do families misunderstand about this approach?
- Common questions about separation surgery
The short answer
What is separation surgery?
Separation surgery is a smaller spine operation that peels tumour away from the spinal cord to leave a thin gap. That gap lets a very focused, high-dose radiotherapy called spine radiosurgery, or SBRT, treat the rest of the tumour without overdosing the cord.
Why not just remove all the tumour?
Taking out every bit of a tumour that has spread to the spine means a much bigger operation, with more bleeding and a longer recovery. With separation surgery, the surgeon removes only the part touching the cord, and screws and rods usually steady the spine at the same time. The radiotherapy then does the heavy work on the tumour left behind.
Why the gap matters to the radiotherapy
The spinal cord can only take a limited dose of radiation. When tumour sits right against it, the radiation team has to hold back the dose to the edge of the tumour, which lets it grow back more easily. A small space lets them aim a strong dose at the tumour while keeping the cord safe.
Who it does not suit
People who are not well enough for surgery, people with cancer in many spine levels, and people whose tumour type melts away well with ordinary radiotherapy alone, such as many lymphomas and myeloma. It also depends on spine radiosurgery being available nearby. If it is offered to you, ask the team to explain why this plan fits your tumour better than radiotherapy alone or a larger operation.
In the operating theatre
What does the surgeon actually do?
It is one operation with three jobs. Not every patient needs all three.
Opening the back of the spine
A cut down the middle of the back. The surgeon removes the bony roof over the spinal cord at the affected level to reach the tumour.
Clearing a rim around the cord
Tumour in front of and around the cord is removed until there is a clear space all the way round. The rest of the tumour in the bone is deliberately left for the radiotherapy.
This is planned, not an incomplete operation.Screws and rods
Screws are placed in the healthy bones above and below, joined by rods. They hold the spine steady while the weakened bone is treated.
Sometimes placed
- Through small cuts in the skin
- Using carbon rods, which blur scans less
Not sure whether this applies to you?
Ask an oncologistThe pathway
What happens between the MRI and the radiosurgery?
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The MRI and the joint decision
Your scan is reviewed by a spine surgeon and a radiation oncologist together. They decide whether surgery first, radiotherapy alone or another plan fits your situation.
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Fitness checks
Blood tests, heart checks and a meeting with the anaesthetist. Bring every medicine you take. Do not stop blood thinners or any other medicine unless the team tells you to.
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The operation and the first days
You are fully asleep. Afterwards you may have a drain and a urine catheter, and a physiotherapist helps you sit and walk early.
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Letting the wound heal
Radiation slows healing, so the team waits until the wound is sound. This gap is usually a few weeks. Tell the team at once if the wound leaks or opens.
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Planning the radiosurgery
A fresh MRI and a planning CT. You may be fitted with a moulded cushion so you lie in exactly the same position each time.
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The radiosurgery sessions
Usually a small number of sessions, sometimes just one. Each takes longer than ordinary radiotherapy because of the careful set-up. You feel nothing while the beam is on.
Did you know
Every case at CION is discussed at a tumour board, with surgical, radiation and medical oncologists in the same room, before a plan is confirmed. For spine tumours, that joint look is how surgery and radiotherapy are fitted together.
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On your report
What do the words in the letters and reports mean?
- SBRT or SRS
- Stereotactic radiotherapy. A few very precise, high-dose sessions aimed at a small target. Despite the word radiosurgery, there is no cut.
- Epidural disease
- Tumour in the space around the spinal cord, inside the spinal canal. This is the part separation surgery clears.
- Bilsky grade
- A score on the MRI report for how much the tumour presses on the cord. Higher grades mean more pressure.
- SINS score
- A score for how unstable the spine is. It helps the team decide whether screws and rods are needed.
- Radioresistant
- A tumour type that responds poorly to ordinary radiotherapy, such as many kidney cancers and melanoma. These are where radiosurgery is most often considered.
Being straight with you
What are the risks, and what does the team weigh up?
Separation surgery is smaller than a full tumour removal, but it is still spine surgery close to the cord. Your surgeon should explain the risks at your level of the spine, and the radiation oncologist should explain the risks of the radiosurgery that follows.
Risks from the operation
Bleeding, wound infection or slow healing, leakage of the fluid around the cord, clots in the legs or lungs, and new weakness or numbness. Over time, screws can loosen and need further surgery.
Risks from the radiosurgery
Pain flare for a day or two, and a later crack in the treated spine bone. Rarely, damage to the spinal cord itself. The gap made by the operation is there to lower that risk.
What this page cannot tell you
Whether this plan is right for you, or how your cancer will behave. That depends on the tumour type, how much of your spine is involved, your other treatment and your general health. Ask what the plan would be without the operation, and whether radiosurgery is available at the centre where you will be treated.
Commonly believed
What do families misunderstand about this approach?
"The surgeon left tumour behind, so the operation failed."
Leaving tumour away from the cord is the plan. The radiosurgery is designed to treat it. Ask the surgeon to show you on the scan what was removed and what the radiation will target.
"Radiosurgery means another operation."
There is no cut. It is a type of radiotherapy. You lie on a couch while a machine delivers beams from many angles.
"Now the cord is free, the radiotherapy can be skipped."
Without the radiosurgery, the tumour left in the bone is likely to grow back towards the cord. The two parts only work as a pair.
"This is the only choice when cancer presses on the spine."
It is one of several. Ordinary radiotherapy, a larger operation or medicines may fit better, depending on the tumour and your health.
Questions we are asked
Common questions about separation surgery
How soon after surgery does the radiosurgery start?
Usually once the wound has healed well, which is often a few weeks. Starting too early raises the chance of the wound breaking down. Starting too late gives the tumour time to grow back. Your surgeon and radiation oncologist agree the timing, and will check the wound before planning begins.
Is separation surgery the same as decompression surgery?
It is a kind of decompression. The difference is the aim. A standard decompression removes as much tumour as is reasonable to free the cord. Separation surgery removes only enough to make a safe gap, because focused radiotherapy is planned to treat the rest.
Which cancers is it most often used for?
Often for tumours that respond poorly to ordinary radiotherapy, such as many kidney cancers, melanoma, some bowel cancers and sarcomas. Cancers that respond well to ordinary radiotherapy, such as myeloma and lymphoma, often do not need surgery first. Your team will explain where your cancer fits.
Does every hospital offer spine radiosurgery?
No. It needs specific machines, planning software and a team used to spine treatment. Before agreeing to separation surgery, ask your centre where the radiosurgery will be given, who will plan it, and how long the wait is likely to be.
Will my mother be able to walk after it?
Nobody can promise this. People who are walking before the operation are more likely to keep walking afterwards. Weakness that came on quickly, or has been present for a long time, is harder to reverse. Ask the surgeon what they expect in her case.
Should she stop chemotherapy or targeted medicines before surgery?
Do not stop anything on your own. Some medicines slow wound healing and the timing matters. The surgeon, anaesthetist and medical oncologist will decide together when to pause and when to restart, and tell you exactly what to do.
What should we watch for at home before radiosurgery?
A wound that turns red, leaks or opens, fever, new weakness or numbness in the legs, trouble passing urine or stools, or a swollen painful calf. Call the team the same day for any of these, or go to the nearest emergency department.
Is it covered by Aarogyasri or insurance?
Surgery and radiotherapy for cancer are often covered when they are part of an approved plan. Aarogyasri, CGHS, ECHS, EHS and most cashless insurers are accepted. Cover for implants and radiosurgery can differ, so call the helpline with your card details for an estimate.
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Dr. C. Raghavendra Reddy
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Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
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Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
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Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Surgical Oncologist
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Surgical Oncologist
Dr. Vinay Mamidala
MBBS, MS(General Surgery), M.Ch(Surgical Oncology), FMAS, FARIS(Ongoing)
Surgical Oncologist
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Dr. Vajja Sandeep Kumar
MBBS, MS (General Surgery), DrNB (Surgical Oncology), FALS Oncology
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Sources
- NICE — Spinal metastases and metastatic spinal cord compression (NG234)
- National Cancer Institute — External beam radiation therapy for cancer
- Macmillan Cancer Support — Spinal cord compression
- American Cancer Society — Bone metastases
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
Related pages
Decompression Surgery for Spinal MetastasesThe larger operation used when more tumour must come outSpinal Cord Compression: Surgery or Radiation?How the team chooses between the twoSpinal Stabilisation With Rods and ScrewsThe fixation placed during separation surgeryRadiation therapy guideHow radiotherapy works and what sessions are like
Talk to us
Been offered surgery before radiosurgery?
Send us the MRI report or call the helpline. A surgical oncologist will go through the plan with you. One helpline serves every CION centre.