Of the many women who face breast cancer, many will choose to have a mastectomy. Only half of these women will go on to have breast reconstruction. One of the reasons for this is the discomfort and long duration of the tissue expansion portion of the breast reconstruction process. This clinical study is designed to compare the performance and safety of the AeroForm™ Tissue Expander System to currently cleared saline tissue expanders. The AeroForm™ System provides a needle free alternative to standard saline expanders and allows patients to participate in the expansion process under the guidance of their physician. For more information, please contact Heather Strom at Heather.Strom@umassmed.edu or 508-856-1729.