Breast Tissue Expander: Pain, Filling, How Long It Stays and Common Problems – Your Questions Answered
A breast tissue expander is a temporary placeholder after a mastectomy (removal of the breast). Over a number of weeks it is filled step by step with salt water (saline). This slowly stretches the skin and muscle. It usually stays in the breast for a few months in total and is then exchanged for a permanent implant.
On this page you will find answers to the questions patients ask most often: about pain, about the fills, about how long the expander stays in and about problems such as an expander that has moved. The answers are kept simple and do not replace a conversation with your own treatment team.
In this article
What is a breast tissue expander?
A tissue expander is an empty, or only slightly filled, silicone pouch with a small valve (port). It is placed under the skin or under the chest muscle, either during the mastectomy or later. Through the port it is filled little by little with saline. This slowly creates room for the implant that comes later.
So the expander is not the final result. It makes space and stretches the skin. That is why this is called a two-stage reconstruction: first the expander, later the permanent implant. You may also hear other names, such as breast expander, expander implant or expander prosthesis. They usually mean the same idea.
For a full overview of the whole journey, read the complete guide to tissue expander breast reconstruction.
How is the tissue expander placed after mastectomy?
The expander can be placed during the mastectomy itself (immediate reconstruction) or later in a separate operation. The surgeon makes a pocket. This pocket lies either in front of the chest muscle or under it. When the expander goes under the muscle, the muscle is partly lifted off the chest wall.
Sometimes a mesh or a tissue matrix (ADM) is added. It supports the lower part of the expander. The operation usually takes one to two hours. Most women go home the same day or after one night. Small tubes (drains) carry away wound fluid and often stay in for one to two weeks.
The expander is already filled a little during the operation. So when you wake up, you already have a small breast shape.
How do tissue expander fills work?
The fills start once the wounds are healing well. That is usually two to three weeks after surgery. The appointments take place in the outpatient clinic or the surgeon's office.
The port and the saline
Inside the expander sits a valve, the port. It lies under the skin and is often magnetic. A small finder device is used to locate the port. The skin is then cleaned. With a fine needle, sterile saline is injected through the port.
How often and how much
Appointments are usually one to two weeks apart. At each visit, 50 to 100 ml is normally added. If the skin feels very tight or looks red, less is added or the team waits longer. So the pace follows your body.
How long an appointment takes
A fill appointment takes about 15 to 30 minutes. Afterwards you can go straight home. Driving, office work and light housework are usually possible again the next day. Avoid heavy lifting for one to two days.
Do the fills hurt? Why does the expander cause pain?
Many women are anxious before the first fill. The good news: the needle itself is usually felt only as a brief pressure. After a mastectomy the skin over the expander is often numb, because the nerves were removed together with the breast tissue.
Tightness after a fill
After each appointment most women feel tightness and pressure. It is strongest on the first and second day. It usually eases within a few days, once the tissue has adjusted to the new volume.
Muscle and nerves
If the expander lies under the chest muscle, the muscle is stretched as well. This can cause a pulling feeling under the collarbone, in the armpit or between the shoulder blades. Some women feel the muscle when they move their arm. Short, sharp or burning sensations are also possible. They happen when small nerves are recovering.
What is normal and what is not
Normal: tightness, pressure, a pulling feeling in the muscle and tenderness for a few days. Simple painkillers from the pharmacy are enough for most women. Ask your treatment team which ones are suitable for you.
Not normal: increasing pain that does not improve, hot or very red skin, fever, fluid leaking from the wound, or a breast that suddenly feels much harder. In these cases, contact your treatment team promptly.
How long can a tissue expander be left in?
This depends on three things: the target volume, how well your skin stretches, and the rest of your cancer treatment.
Filling phase: usually a few weeks to a few months. Young, supple skin often needs fewer visits than scarred or irradiated skin.
Resting phase: after the last fill, the team waits about one to three months so the tissue can settle.
Total time: in all, the expander often stays in the breast for around four to six months.
With chemotherapy or radiation therapy the expander can stay in much longer. Some women then have it for a year or more. Medically this is fine, but many women find it a burden. Ask for a timeline you can write down.
What if the tissue expander has moved or turned?
An expander can shift inside its pocket. It may then sit too high, too far to the side, or it may rotate. This happens in a small number of patients. Possible reasons are gravity, a knock, a collection of fluid, or a firm scar capsule.
How do you notice it? The shape of the breast changes, the breast looks uneven, or the port is suddenly hard to find. There does not have to be any pain. A tissue expander that has moved is not an emergency. But do show it to your treatment team at your next visit.
What happens next: often the team first keeps an eye on it and adjusts the fills. In most cases the position is corrected at the exchange for the implant. Only rarely is a separate operation needed to reposition the expander. A supportive bra without underwire helps to keep the expander in place.
What does a breast with a tissue expander look like?
Many women search for pictures. The key point: a breast with an expander looks different from the later breast with an implant. The expander is a placeholder, not the result.
Shape: rounder and often higher than a natural breast. It is flat at the start and becomes fuller with each fill.
Firmness: the expander feels firm and tight, much firmer than a soft silicone implant. When you lie down it hardly moves.
Asymmetry: with a reconstruction on one side, the difference from the other breast is often clear. That is normal at this stage.
Skin and scar: the scar is red at first and fades slowly. The port can sometimes be felt as a small bump.
In a bra and in clothes the difference is usually far less visible than without. Shape, softness and symmetry are only improved at the exchange for the permanent implant, often together with fat transfer (lipofilling).
Tissue expander and radiation therapy: what changes?
Radiation therapy makes the skin and tissue firmer and less stretchy. With an expander or implant reconstruction this raises the risk of wound problems, a hard scar capsule (capsular contracture) and changes in shape.
If radiation is planned, the timeline is agreed between the plastic surgery team and the radiation team. Some teams fill the expander quickly before radiation starts. Others leave it partly filled during radiation. Filling fast does not automatically lower the risk. After radiation the team often waits longer until the tissue has settled.
With irradiated skin, reconstruction with your own tissue can also be a good alternative. Read more in How Radiation Therapy Affects Your Breast Reconstruction Options.
What is an expander implant (Becker) and when is no exchange needed?
An expander implant, such as the Becker implant, combines the expander and the permanent implant in one device. The outer part is silicone gel. An inner chamber is filled step by step with saline. The port sits a little away from the implant, connected by a thin tube, usually near the armpit.
Once the desired size is reached, the tube and port are removed through a small cut. The implant stays in the breast. A second major operation for the exchange is then not needed.
The downside: the final shape is decided when the device is placed. With the classic two-stage route, the surgeon can adjust the pocket at the exchange and choose a different implant. With an expander implant, this fine-tuning is less possible. Whether it suits you depends on your skin, your breast size and your wishes.
What problems can occur with a tissue expander?
Most women get through the expander phase without major problems. Still, it helps to know the possible complications.
Infection: mostly in the first weeks. Signs are redness, warmth, pain and fever. Antibiotics often help. With a serious infection the expander has to be removed for a while.
Capsular contracture: the body forms a scar layer around any foreign object. If it becomes hard, the breast can feel firm, painful or misshapen. After radiation the risk is higher.
Wound healing problems: with thin skin or fills that are too fast, the wound can open or the skin over the expander can suffer. The team then fills more slowly or does a small wound repair.
Fluid or bruising: a collection of wound fluid (seroma) or blood (haematoma) can cause swelling and pressure and sometimes has to be drained.
Removal of the expander: with a serious infection, an exposed area or major problems, the expander is removed. After a healing break of a few months, the reconstruction can often be started again, with an expander or with your own tissue.
Ask your treatment team which warning signs matter for you and who you can reach at the weekend.
What comes next: the exchange for an implant
About one to three months after the last fill, the second operation follows. The expander is removed through the same scar. The pocket is adjusted, and the permanent implant, silicone gel or saline-filled, is placed. If needed, your own fat is added to smooth the contours.
This operation takes about one to two hours and is much easier than the first step. Most women report tenderness and tightness, but far less pain. To read how healing goes week by week, see Tissue Expander to Implant Exchange: Surgery and Recovery.
The animation shows the basic route from tissue expander to implant. The position, the fill schedule and the timing of the exchange are decided for each patient individually.
Patient experiences: what women often report
From many conversations a similar picture emerges. The first week after the expander is placed is the hardest. After that it gets better step by step. The fills are less bad than expected. The tightness after each visit is annoying but bearable.
Three things are most often described as hard: the firm, foreign feeling of the expander, the difference from the other breast, and the long wait until the exchange. What helps: a clear timeline, a well-fitting bra without underwire, sleeping on your back with your upper body raised, and talking with other women who have been through it.
Almost all say later: the expander was a transition. Only with the permanent implant does the breast feel like part of the body again. But every experience is different. Your journey may be easier or harder than that of other women.
Frequently asked questions about breast tissue expanders
Does a breast tissue expander hurt?
Placing the expander usually causes a pressing pain in the first days, especially when it lies under the muscle. A fill itself is mostly just a brief pressure. Afterwards many women feel tightness for one to three days, which settles on its own.
How often is a tissue expander filled?
The fills usually start two to three weeks after surgery. After that, appointments follow about every one to two weeks. At each visit, 50 to 100 ml of saline is usually added. The pace is adjusted to your skin and how you feel.
How long can a tissue expander be left in?
Filling usually takes a few weeks to a few months. Then comes a resting phase of about one to three months. In total the expander often stays in the breast for around four to six months. With chemotherapy or radiation therapy it can take longer.
Can a tissue expander move in the breast?
Yes, occasionally an expander can shift or turn. You then notice a change in shape or position, for example too high or too far to the side. It is not an emergency, but you should show it to your treatment team. Often the position can be corrected at the exchange for the implant.
What does a tissue expander look like?
A breast with an expander is rounder, firmer and often sits higher than a natural breast. It is a placeholder and not yet the final result. Shape, softness and symmetry are only improved at the exchange for the permanent implant.
Can I have an MRI with a tissue expander?
Many expanders have a magnetic port. An MRI scan is then often not possible, or only under certain conditions. Before any MRI, say that you have a tissue expander and bring your implant card.
What is an expander implant (Becker implant)?
An expander implant combines the expander and the permanent implant in one device. It is filled through a small port and then stays in the breast. No exchange is needed. The shape can be fine-tuned less later on, though.
When is the tissue expander exchanged for an implant?
The exchange is usually planned one to three months after the last fill. In that time the tissue settles. The operation takes about one to two hours and hurts much less than the first placement of the expander.
Questions to ask your surgeon
Is my expander in front of or under the chest muscle, and why?
How often and how much will I be filled, and how long will it take in total?
Does my expander have a magnetic port, and what does that mean for MRI scans?
What changes in the plan if I need radiation therapy or chemotherapy?
Which warning signs should I report straight away, and who can I reach outside office hours?
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Written by Dr. Mahyar Foumani, plastic and reconstructive surgeon specializing in breast reconstruction. Based on the book 'Breast Reconstruction Explained.'
This article is education, not medical advice
This article explains in plain words how breast reconstruction works. It is meant to help you understand what is possible, so that you and your doctor can make a good decision together. It does not replace personal medical advice.
Every situation is different. What is best for you depends on your body, your illness, your treatment and your own wishes. So always follow the advice of your own doctor or care team. Do you have symptoms, or are you unsure about something? Please contact your doctor or GP. In an emergency, call your local emergency number.
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