What Exactly Is a Tissue Expander?
A tissue expander is a temporary, adjustable balloon placed under the chest skin to gradually create room for a future implant or flap.
After a mastectomy there is often not enough skin to cover a full-sized implant right away. A tissue expander solves this by stretching the remaining skin and muscle slowly, the way skin stretches during pregnancy. It is a staging device, designed from the start to be swapped out later.
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The expander goes in flat or partly filled, usually during the mastectomy itself. Over the following weeks it is enlarged step by step at clinic visits until the pocket reaches the planned size, then a second operation exchanges it for the final implant or, in some plans, a tissue flap.
How fast the skin stretches and how the process feels varies between patients — tightness for a day or two after each fill is common. If radiation is part of your treatment, tell the team early, as it changes how the expander stage is planned; a specialist consultation will set the sequence.
MediIndex articles are for general information only and are not medical advice, diagnosis, or advertising. Outcomes vary by individual — consult a board-certified specialist for personal decisions.