Breast expansion surgery, most commonly performed using tissue expanders, is primarily used in breast reconstruction following mastectomy. It can also be used in cosmetic augmentation when the existing skin envelope is too tight to accommodate an implant directly. Here is a complete overview of how the process works.
What Is a Tissue Expander?
A tissue expander is a temporary, balloon-like device placed beneath the chest muscle (pectoralis major) after mastectomy or in preparation for breast augmentation. It is gradually filled with saline over several weeks to slowly stretch the overlying skin and muscle, creating the necessary space and pocket for a permanent implant.
- Made of silicone with a fill port accessible through the skin
- Filled incrementally via clinic appointments every 1–2 weeks
- Remains in place for several months before exchange surgery
The Two-Stage Reconstruction Process
Breast reconstruction using tissue expanders is a two-stage process:
- Stage 1, Expander placement: The expander is placed at the time of mastectomy or in a separate procedure. It is gradually filled over 2–4 months until the desired size is achieved and the tissues have adequately expanded.
- Stage 2, Implant exchange: Once expansion is complete and tissues have had time to settle (typically 2–6 months), the expander is removed in a second surgery and replaced with a permanent silicone or saline implant.
What Does the Expansion Process Feel Like?
Each fill appointment takes only a few minutes. Patients typically feel a sensation of tightness or pressure after each fill that eases over 24–48 hours. Some patients describe mild discomfort or a pulling sensation at the fill site. Over-the-counter pain relievers are usually sufficient for managing post-fill discomfort.
Risks and Considerations
As with any implantable device, tissue expanders carry specific risks:
- Infection at the expander site (most serious complication, may require expander removal)
- Capsular contracture around the expander
- Expander deflation or malposition
- Skin thinning or necrosis from over-expansion
- Delayed radiation (if applicable) may affect timing and outcomes
Your surgical team at Svelta Plastic Surgery will discuss the full risk profile and help you determine whether a one-stage or two-stage approach is most appropriate for your anatomy and medical history.