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Wire and seed localisation before lumpectomy | CION Cancer Clinics
A wire or tiny seed is placed in the breast before a lumpectomy when the cancer cannot be felt by hand. A radiologist puts it in using a mammogram or ultrasound, with the breast numbed while you are awake. It shows the surgeon exactly where to operate. This page explains the kinds of marker, what happens on the day and what to tell the team. 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 is a wire or seed placed before breast surgery?
- What kinds of marker are used?
- What happens when a wire is placed?
- What do the words on the forms mean?
- What do people worry about that is not true?
- What should you tell the team beforehand?
- What does a marker not do?
- Common questions about wire and seed localisation
The short answer
Why is a wire or seed placed before breast surgery?
A wire or a tiny seed is placed in the breast before a lumpectomy when the cancer cannot be felt by hand. It marks the exact spot, so the surgeon can find the area seen on your mammogram or ultrasound and remove it with a rim of healthy tissue.
Why a lump you cannot feel still needs removing
Many breast cancers today are found on a mammogram long before they form a lump. That is good news, because they are often small. But in the operating theatre the surgeon cannot see a mammogram inside the breast. Without a guide, finding a small area in soft tissue is very difficult, and more healthy tissue would have to come out.
It is done by a radiologist, not the surgeon
A radiologist, the doctor who reads breast scans, places the marker using a mammogram or ultrasound to guide the needle. It is done with the breast numbed, and you stay awake. The surgeon then follows the marker during your operation.
Who does not need one
If your cancer can be felt clearly and seen well on ultrasound, you may not need a marker at all. Some surgeons use ultrasound in theatre instead.
This page describes common methods. Which one you have depends on what your centre uses.The options
What kinds of marker are used?
All of them do the same job. They differ in when they can be placed and how the surgeon finds them.
Guide wire
A thin, flexible wire with a small hook at the tip. One end sits in the cancer and the other comes out through the skin, taped under a dressing. It is usually placed on the day of surgery.
Radioactive seed
A metal seed about the size of a grain of rice, carrying a very small amount of radioactivity. The surgeon finds it with a handheld probe.
It is removed with the tissue during surgery.Magnetic or radar seeds
Tiny seeds found with a magnetic or radar probe instead of radioactivity. They can be placed days or weeks ahead, so the placement does not have to happen on the morning of surgery.
Clip placed at biopsy
A small metal clip is often left at the time of your biopsy. It is not a localisation marker on its own, but it shows the radiologist where to put one.
Ask your centre
- Which method they use
- When it will be placed
Not sure whether this applies to you?
Ask an oncologistOn the day
What happens when a wire is placed?
-
Arriving at the imaging department
You come to the breast imaging room first, usually on the morning of surgery, already fasting as instructed. Wear a top that opens at the front.
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Finding the spot on the scan
The radiologist takes a mammogram or scans with ultrasound to find the area or the biopsy clip. With a mammogram, the breast is held gently between plates for the whole placement.
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Numbing and placing the wire
The skin is numbed with an injection. A fine needle carrying the wire is guided to the spot, then withdrawn, leaving the wire in place. Most people feel pressure rather than sharp pain.
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A check picture
A final mammogram confirms the tip is in the right place. The images go to the surgeon along with you.
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Dressing and waiting for theatre
The end of the wire is taped under a dressing. Avoid pulling at it or lifting the arm high while you wait.
On your paperwork
What do the words on the forms mean?
- Non-palpable
- The cancer cannot be felt by hand. This is the usual reason a marker is needed.
- Localisation
- Marking the exact position of the area before surgery, with a wire or seed.
- Specimen X-ray
- An X-ray of the removed tissue, taken during the operation, to check the marker and the area came out.
- Margin
- The rim of healthy tissue around what was removed. A clear margin means no cancer cells at the edge.
- Microcalcifications
- Tiny calcium specks on a mammogram that can be the only sign of an early cancer.
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Commonly believed
What do people worry about that is not true?
"Putting a needle into the cancer will spread it."
Placing a wire or seed does not make breast cancer spread through the body. The marker and the area around it are removed in the same operation.
"The wire could break off and stay inside me."
The wire is removed together with the tissue, and the specimen X-ray checks that it came out. You are asked not to pull at it, and the surgical team handles it carefully.
"A radioactive seed will harm my children at home."
The amount of radioactivity is very small and sits deep in the breast until it is taken out. Your team will tell you if they want you to take any simple precautions.
"Needing a marker means the cancer is worse."
It usually means the opposite. A marker is needed because the cancer was found early, before it could be felt. It says nothing about how serious it is.
Before you go
What should you tell the team beforehand?
- Any blood thinners you take, such as aspirin or clopidogrel
- Any chance you could be pregnant
- A pacemaker or other implant, which matters for some seeds
- If you have fainted during a needle test before
- If holding still in a mammogram is hard for you
- Bring your biopsy report and earlier mammogram films
Being straight with you
What does a marker not do?
A wire or seed helps the surgeon find the right place. It does not decide how much tissue is removed, and it does not show whether the margins are clear. That answer comes from the laboratory days later.
Medicines are for your doctors to adjust
Blood thinners can increase bruising, but do not stop or change any medicine on your own. Your surgeon and the doctor who prescribed it will decide what to do and when.
What to ask your centre
Ask which marker they use and why, whether it is placed on the day or earlier, and who to call if a seed was placed ahead and something feels wrong. Ask whether your family member can wait with you while the wire is placed.
What the next day looks like
The small hole where the wire came out sits inside your surgical dressing and heals with the main wound. You will not need a separate follow-up for it. The results that matter, about the margins and the lymph nodes, come at your follow-up visit with the surgeon.
If the plan changes
Occasionally the placement is harder than expected, or the check picture shows the tip needs adjusting. That can delay surgery a little. It is a normal part of the process, not a sign that something has gone wrong.
Questions we are asked
Common questions about wire and seed localisation
Does wire localisation hurt?
The skin is numbed first, so most people feel pressure and a brief sting from the numbing injection. Holding still in the mammogram can be the least comfortable part. Once the wire is in, you usually feel very little. Tell the radiologist if anything becomes sore during the procedure.
Will I be awake while the wire goes in?
Yes. It is done with local numbing while you are awake, because the radiologist needs you in position for the mammogram or ultrasound. The general anaesthesia for your operation comes afterwards, in theatre.
Can I walk around with the wire in?
Yes, you can walk to the ward and sit while you wait. Keep the dressing dry, do not pull at it, and avoid lifting the arm on that side high above your head. If the dressing comes loose, tell a nurse straight away.
Is the seed removed, or does it stay in my breast?
It is removed during the operation with the tissue around it. The specimen X-ray taken in theatre confirms it has come out. Metal clips from your biopsy or surgery may stay behind, which is different and harmless.
How far ahead can a seed be placed?
Seeds can be placed days or sometimes weeks before surgery, depending on the type. Your centre will give you the timing for the one they use. A wire, by contrast, is usually placed on the day of the operation.
What if the marker ends up in the wrong place?
The check picture is taken for exactly this reason. If the tip is not close enough, the radiologist can adjust it or place another before you go to theatre. The surgeon also reviews the images before starting.
Can a family member stay with me?
Often they can wait just outside and join you afterwards. The imaging room itself is usually for you and the staff only, because of the X-rays. Ask the centre in advance so your family knows where to wait.
Is localisation covered by Aarogyasri or insurance?
When it is part of planned breast cancer surgery, localisation is usually included along with the operation under Aarogyasri, CGHS, ECHS, EHS and most cashless insurance. Call the helpline with your card or policy details to check your own cover.
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MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
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Dr. Vinay Mamidala
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Sources
- Cancer Research UK — Surgery for breast cancer
- American Cancer Society — Surgery for breast cancer
- National Cancer Institute — Surgery choices for women with DCIS or breast cancer
- Macmillan Cancer Support — Breast 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.
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