Hi, I'm an expert in oncoplastic breast reconstruction, and use the term to mean reconstruction of a breast, specifically and only in the setting of breast conservation. I don't use the term when referring to post mastectomy reconstruction.There are many different techniques that exist, however the over-riding goal of the operation is to allow a 'lumpectomy' to be performed, while at the same time rearranging breast tissue to assure that there is no deformity after healing and radiation. The reason oncoplastic reconstruction is necessary is that even small lumpectomies can and do result in deformities. Often, these patients will be advised to have mastectomies instead to avoid this deformity. If an oncoplastic technique is used, even large lumpectomies can be performed, and often can yield a breast that is more youthful and shapely than before surgery! In my practice, I routinely offer and perform surgery on the opposite breast at the same time, so that the final result will be symmetric.