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Why clips are left behind after breast surgery | CION Cancer Clinics
Small metal clips are left in the breast after a lumpectomy to mark where the lump was. They guide radiotherapy to the right spot and help doctors read your future mammograms. They are meant to stay for life and very rarely cause problems. This page explains which markers stay and which come out, what reports say about them, and what to tell other doctors. 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
- Why are small metal clips left in the breast after surgery?
- Which markers stay in, and which come out?
- When do the clips matter during your treatment?
- What do the words about clips on a report mean?
- What worries people about the clips, and what is true?
- What do the clips do, and what do they not do?
- What should you tell other doctors, and when should you ask?
- Common questions about clips after breast surgery
The short answer
Why are small metal clips left in the breast after surgery?
The clips are markers. They show your radiotherapy team and the doctors reading your future mammograms exactly where the lump used to be. They are meant to stay in for life, and for almost everyone they cause no trouble at all.
Why the spot needs marking
Once a lump is removed, the breast heals and the space closes. From the outside, and often on a scan, it becomes hard to tell precisely where the cancer sat. That spot, called the tumour bed, is the area radiotherapy most needs to reach. It is also the area doctors want to watch most closely in the years ahead. A few tiny clips placed around it solve both problems.
What they are made of
Most clips are made of titanium or a similar metal that the body accepts well. They are very small, often compared to a grain of rice or smaller. You cannot usually feel them, and they do not rust, dissolve or react with the tissue around them.
Why nobody mentioned them
Many people only learn about the clips when a mammogram report mentions them, or when a scan technician asks. That can be alarming. It usually means the surgeon placed them as a routine part of the operation, and the clips are doing exactly what they were put there to do.
Not all the same marker
Which markers stay in, and which come out?
Several different markers can be used on the way to and during a lumpectomy. Only some of them are left behind.
A clip placed at biopsy
When a needle biopsy is taken, a tiny clip is often left at the spot so it can be found again. It is usually removed with the lump during surgery, and the laboratory confirms it was in the tissue.
Clips in the tumour bed
During the lumpectomy the surgeon may place several clips on the walls of the space left behind. These are the ones that stay. They guide radiotherapy and later imaging.
A clip before chemotherapy
If chemotherapy is given before surgery, the lump may shrink until it cannot be seen. A clip placed first marks where it was, so the surgeon still knows what to remove.
Wires and seeds
A thin wire or a small seed may be placed before surgery to guide the surgeon to a lump that cannot be felt. These are taken out during the operation and are not left behind.
Which of these your centre uses varies. Ask what was placed in your own breast.Not sure whether this applies to you?
Ask an oncologistAlong the way
When do the clips matter during your treatment?
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In the operating theatre
Before closing the wound, the surgeon places the clips around the space where the lump was. This adds very little time and does not change how the wound heals.
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Radiotherapy planning
You have a planning scan before radiotherapy starts. The clips show up clearly on it, so the team can outline the tumour bed accurately. This matters most when an extra dose, called a boost, is given to that area.
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During radiotherapy
On some machines, the clips help the team check that you are lying in the same position for each session. You will not feel anything from them.
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Your follow-up mammograms
The clips appear as tiny bright marks. They tell the doctor reading the mammogram where the scar is, so normal healing changes there are not mistaken for something new.
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Any later scan or operation
If you ever need an MRI, a CT scan or another breast operation, the clips help doctors orient themselves. Tell every new team they are there.
On your report
What do the words about clips on a report mean?
- Surgical clips
- The metal markers placed during the operation. Seeing them on a mammogram is expected.
- Marker clip or biopsy marker
- A clip left at the site of a needle biopsy, usually before surgery.
- Tumour bed
- The space where the lump was removed, which the clips outline.
- Post-surgical changes
- Scar tissue and healing changes around the operation site. A common, reassuring phrase on follow-up reports.
- Clip migration
- The clip has moved a little from where it was placed. It usually does not matter, but the radiologist notes it.
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Commonly believed
What worries people about the clips, and what is true?
"Metal left inside will cause cancer or infection later."
The metals used are the same kind used in joint replacements and heart surgery, chosen because the body tolerates them. They are not known to cause cancer. Infection from a clip on its own is very unusual.
"I will set off the airport metal detector."
The clips are far too small for that. People travel, go through security gates and enter temples and offices with detectors without any issue. You do not need to carry a letter.
"I can never have an MRI now."
Most breast clips are safe in an MRI scanner. They may cause a small blur on the picture near the clip. Always tell the scan centre about them, and let the staff check the type if they ask.
"The clips should be taken out once radiotherapy is over."
They are meant to stay. Removing them would need another operation and would take away a useful guide for future mammograms. Doctors do not remove them unless there is a specific problem.
Side by side
What do the clips do, and what do they not do?
What the clips do
What they do not do
Mark where the lump was, for life
They do not treat the cancer or lower its chance of returning
Help aim radiotherapy at the tumour bed
They do not make radiotherapy stronger or more harmful
Guide the reading of later mammograms
They do not hide a new cancer from the doctor reading the scan
Stay in place quietly in almost everyone
They do not need checking or removing on their own
Being straight with you
What should you tell other doctors, and when should you ask?
Tell any doctor or scan centre that you have surgical clips in your breast. That one sentence is usually all that is needed. Keep a copy of your operation note, because it often records how many clips were placed and where.
When a clip is worth asking about
A clip on its own rarely causes symptoms. If you feel a small, sharp point under the skin, notice a wound that opens or will not heal, or see redness and swelling around the scar, show your surgeon. These are more likely to be about healing than about the clip, but they should be checked.
For the family keeping the records
If you are the son or daughter managing the files, keep the operation note and every mammogram report together. Take them to each follow-up visit.
What this page cannot tell you
It cannot tell you what type of clip was used in your own breast, or whether a specific scanner is suitable. Your surgeon's notes and the scan centre can answer that.
Questions we are asked
Common questions about clips after breast surgery
Can I feel the clips in my breast?
Almost never. They are tiny and sit deep in the breast tissue around the space where the lump was. What people usually feel after a lumpectomy is scar tissue or firm healing tissue, which can be quite noticeable in the early months. If you feel something sharp or new, show your surgeon.
Are the clips safe for an MRI scan?
Most breast clips are safe in an MRI scanner, because they are made of metals that are not strongly magnetic. They can cause a small blurred area on the pictures. Always tell the scan centre before the scan, and bring your operation note if you have it, so staff can check.
Will the clips show on my mammogram?
Yes, as small bright marks. That is expected and useful. The doctor reading the mammogram uses them to find the scar and compare it with earlier scans. The report may call them surgical clips or post-surgical changes. Neither phrase means something is wrong.
Can a clip move out of place?
A clip can shift a little from where it was put, especially one placed at biopsy. The radiologist may note this on the report. It rarely matters for your care. The team uses all the information together, not the clip alone, to plan radiotherapy and read scans.
Were the clips put in without asking me?
Placing clips is usually part of the standard lumpectomy, covered by the consent for the operation. Many people are not told in detail. If you would like to know more, ask your surgeon to explain what was placed and why. You are entitled to a copy of your operation note.
Do clips affect breastfeeding or pregnancy later?
The clips themselves are not known to affect a future pregnancy. Breastfeeding from a breast that has had surgery and radiotherapy is often reduced, but that is due to the treatment, not the clips. If you are planning a pregnancy, talk to your oncologist about timing and your medicines.
Do I need to tell my dentist or physiotherapist?
It is not important for most dental work or physiotherapy. It matters most for scans, especially MRI, and for any future breast operation or biopsy. Adding it to a short list of your medical history that you keep on your phone is a simple way to never forget.
Can I ask for the clips to be removed?
You can ask, but surgeons usually advise against it. Removal needs another operation, and finding such tiny markers in healed tissue is not simple. It also takes away a useful guide for future scans. Removal is considered only if a clip is causing a real problem.
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Dr. Vinay Mamidala
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Dr. Vajja Sandeep Kumar
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Sources
- American Cancer Society — Breast-conserving surgery (lumpectomy)
- Cancer Research UK — Surgery for breast cancer
- National Cancer Institute — Breast Cancer Treatment (PDQ) - Patient Version
- 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.
Keep reading
Related pages
Wire and Seed Localisation Before LumpectomyThe markers that guide the surgeon and then come outWhy Radiation Is Almost Always Needed After LumpectomyThe treatment the clips help aimMammogram and Follow-Up After LumpectomyHow the clips are used on your yearly scansHardness and Lumps in the Breast After SurgeryWhat you are more likely feeling near the scar
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