Hello and thanks for posting your question.I'm not sure the origin of your question, but briefly:Tissue expanders are typically placed at the time of mastectomy to "begin" the process of breast reconstruction. They hold space and can be expanded to increase space needed for replacement with more permanent breast implants. The tissue expanders typically remain in place for 2-3 months after they have been filled to the goal volume and are then removed and replaced with silicone implants of a similar size.I would highly recommend discussing your specific questions with your plastic surgeon and wish you the best of luck.
YesExpanders are filled to a certain volume at the time of surgery.It may not be necessary to fill them ant further before replacement with the final implant