Tissue Expander

Breast reconstruction after mastectomy often happens in stages. In the first stage, a tissue expander — a deflated, silicone shell — is placed beneath the chest muscle at the time of mastectomy or in a separate procedure. It looks a bit like a flat balloon with a small magnetic port through which saline solution can be added.

Over the following weeks, you return to your surgeon's office periodically for small saline injections that gradually inflate the expander. This slow process allows the skin and underlying muscle to stretch at a pace the body can accommodate, reducing the risk of complications. It can take several weeks to months to reach the desired size.

Once the tissue has been adequately stretched and you have recovered from any additional treatments like radiation, a second surgery replaces the temporary expander with a permanent saline or silicone implant. Some newer approaches allow for faster expansion or even direct-to-implant reconstruction, depending on individual factors. Your surgical team will help you understand which approach makes the most sense given your body and treatment plan.

Understanding the tissue expander process helps set realistic expectations for reconstruction. The staged approach — while it involves multiple procedures — allows your surgical team to fine-tune size and shape and gives the body time to adapt, which often leads to better cosmetic results and fewer complications than rushing to a permanent implant.

Knowing what to expect from the expansion appointments — which typically involve brief injections in a clinic setting — helps make the process feel less daunting. Many people find that having a clear picture of each step makes the overall reconstruction journey feel more manageable and in their control.