Thank you for your question. Many breast reconstruction patients ask me about what they can expect with tissue expanders. For many breast reconstruction patients, the first step involves placement of a breast tissue expander--a breast-shaped device with an easy-to-access port--regardless of whether the patient' final result will be an implant reconstruction or a living tissue reconstruction. This inflatable device is wrapped in a regenerative support scaffold and placed carefully under the mastectomy skin at the time of your initial mastectomy surgery. In some cases, this is placed under the pectoralis muscle. When appropriate, I prefer to do a less invasive implant reconstruction in which the implant is placed on top of the pectoralis muscle. This reconstruction can performed with a nipple-sparing mastectomy for an exceptionally natural-looking result. Depending on the desired size of your new breast, the tissue expander will be expanded once every 1-2 weeks at your surgeon's office by the addition of saline through the port. This will stretch your skin until it can accommodate your desired breast size. Surgery to insert the tissue expander takes me about two hours, and I inject a long-lasting pain blocking medication to reduce postoperative pain. My patients spend one night in the hospital. Several surgical drains are used in the breast and stay in for two weeks. Most patients have little to no pain associated with their tissue expanders. In very thin patients, there are sometimes complaints of discomfort along the upper ribs. This is usually resolved by decreasing the volume of saline in the expander. If the patient is experiencing pain, we will decrease the volume, then add more saline to the expander 1 week before the final implant or living tissue surgery.