Medical Oncologist
Before your operation
Wire and seed localisation before breast surgery
Some breast cancers can be seen on a scan but cannot be felt by hand. Localisation is how your surgeon is shown exactly where to operate: a fine wire or a tiny marker is placed into the area beforehand under scan guidance. This page explains what the appointment involves, how wires and seeds differ, and what happens in theatre.
NG
Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed September 2026, next review due September 2027
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The short answer
What is wire localisation, and why do I need it?
Some breast cancers can be seen on a scan but cannot be felt by hand. Localisation is how the surgeon is shown exactly where to operate: a fine wire or a tiny marker is placed into the area beforehand, under scan guidance, so the right tissue is removed.
Why it is needed at all
An area found on a mammogram may be a few millimetres across and deep inside the breast. Once you are lying flat and asleep, the breast changes shape and there is nothing to feel. Without a marker the surgeon would be operating from memory of a picture, which is not good enough.
The two ways it is done
The older method places a fine wire that stays partly outside the skin until surgery. The newer methods place a small seed or clip entirely inside the breast, which the surgeon then finds with a handheld probe. Both work. The difference is mostly in timing and comfort.
Which method you are offered usually depends on what your hospital has, not on how serious your cancer is.On the day
What actually happens, from arrival to theatre
You go to the imaging department first
Usually on the morning of surgery for a wire, or days to weeks beforehand for a seed. You are awake and sitting or lying, depending on whether a mammogram or an ultrasound is being used to guide it.
Local anaesthetic, then the placement
The skin is numbed. A needle is passed to the area under scan guidance and the wire or seed is released. Most women describe pressure rather than pain. It takes a few minutes.
A check picture
Another image confirms the marker is exactly where it should be. If it has moved slightly, it is adjusted then, which is far better than discovering it in theatre.
The wait before surgery
With a wire, it is taped down and you wait with it in place. This is the part women find most awkward. With a seed, you simply go about your day until the operation date.
In theatre
The surgeon follows the wire, or finds the seed with a probe, and removes the tissue around it. The removed piece is X-rayed on the spot to confirm the marker and the target came out together.
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Wire and seed localisation, compared
Wire localisation
Seed or marker localisation
Placed on the morning of surgery
Can be placed days or weeks in advance
Part of the wire stays outside the skin
Sits entirely inside the breast
You wait with it taped in place
You go home and return on the surgery date
Theatre lists depend on imaging running to time
Scheduling is easier, so delays are less likely
Available almost everywhere
Needs particular equipment, so not offered at every centre
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Worth asking
What to settle before the day
These are the questions that change how your day actually goes.
Which method am I having
It determines whether you come in early on the day of surgery or attend a separate appointment beforehand, and how long you will be waiting around.
How long between placement and theatre
With a wire this can be several hours. Knowing in advance lets you plan who waits with you, and whether you can eat beforehand.
Ask specifically
- What time to arrive
- When to stop eating and drinking
- Whether someone can stay with me
Is a clip already in place from my biopsy
Many women already have a tiny marker clip left at the time of biopsy. Sometimes that is enough to guide surgery, which can avoid a separate procedure.
What happens if the marker moves
It is uncommon, and it is checked for before you go to theatre. Ask what the plan would be, so an unexpected delay on the day is not also a surprise.
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Being straight with you
What it does and does not settle
Localisation makes sure the right area is removed. It does not tell anyone whether the edges of what came out are clear, and that is a separate question answered days later by the pathology report.
Why a second operation is still possible
Even with the target removed exactly, cancer can extend further into the surrounding tissue than the scan showed. If the margin comes back involved, a further small operation may be advised. This is not a sign the localisation failed.
The X-ray in theatre is not the final answer
The picture taken of the removed tissue confirms that the marker and the target are in the specimen. It cannot show microscopic cancer at the edge. Teams check it because it catches the obvious problem immediately, not because it replaces the report.
What to expect afterwards
Bruising around the placement site is common and settles over a week or two. The wire or seed comes out with the tissue, so nothing is left behind. If you develop spreading redness, increasing pain or a fever, ring the ward number you were given rather than waiting for your follow-up appointment.
Commonly believed
What women expect before the day
Needing a wire means the surgeon is unsure what to do.
It means the opposite. A wire is used when the target is known precisely from a scan but cannot be felt by hand. It is how certainty from the imaging is carried into theatre, rather than a sign of doubt about the plan.
The wire will be left inside me.
It comes out with the tissue at your operation, and the removed piece is X-rayed to confirm it. The only thing that may stay is the tiny clip placed at the time of your biopsy, which is harmless and will not set off airport scanners.
Having it placed is worse than the surgery.
The skin is numbed and the placement takes a few minutes, with pressure rather than pain. What women actually find hard is the waiting afterwards with a wire taped in place, which is why knowing the timings in advance helps so much.
If the marker was placed correctly, my margins will be clear.
These are two different questions. Localisation makes sure the right area is removed. Whether cancer reached the edge of that piece is answered days later by the pathology report, and a further small operation is sometimes advised even when everything went perfectly.
Questions we are asked
Common questions about localisation
Does it hurt?
The skin is numbed first, so most women describe pressure and a pushing sensation rather than pain. The awkward part is usually the wait afterwards with a wire taped in place. Tell the radiologist if you are feeling sharp pain, because more local anaesthetic can be given.
Can the wire move before surgery?
Slight movement can happen, which is why a check picture is taken and why the wire is taped down firmly. Avoid pulling at it or changing clothes unnecessarily. If it is dislodged, tell the staff immediately rather than waiting to mention it in theatre.
Is the seed radioactive?
Some seed systems use a very small radioactive source, others use magnetic or radar markers that are not radioactive at all. Where a radioactive seed is used the dose is tiny and poses no risk to your family. Ask which system your hospital uses if it concerns you.
Will the marker stay in my body?
No. It is removed along with the tissue at your operation, and the removed piece is X-rayed to confirm it came out. The tiny clip left at the time of a biopsy is different and may stay, which is harmless and does not set off airport scanners.
Can I eat before it is placed?
Follow the fasting instructions for your surgery, not for the localisation. Because the two usually happen on the same morning, you will normally be fasting already. Ring the ward if the instructions you were given are unclear.
What if I cannot feel the lump myself?
That is precisely why localisation exists. Being unable to feel it is common with cancers found by screening and does not mean the finding is uncertain. The scan that found it is what guides the placement.
Does it mean my cancer is small?
Often, yes, and that is generally good news. Localisation is used when something cannot be felt, which usually means it is small or sits deep. Your stage is worked out from the pathology report rather than from the fact that a wire was needed.
Who places it, the surgeon or the radiologist?
A radiologist, because it is done under scan guidance in the imaging department. Your surgeon then uses it in theatre. If you want to ask about the placement itself, the imaging team is the right group to ask.
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Speak to a breast cancer specialist
Call the helpline or leave your details, and someone will help you arrange a consultation at the CION centre nearest you. One helpline serves every CION centre.
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Sources
- Cancer Research UK — Breast cancer surgery
- National Cancer Institute — Wire localization
- Breast Cancer Now — Breast-conserving surgery
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.