Breast surgeon: Usually a general surgeon who is especially skilled in operating on the breast. A breast surgeon may biopsy a tumor in the breast and, if it is malignant, remove the tumor. A breast surgeon may also do breast reconstruction following a mastectomy for breast cancer. The surgeons who carry out this type of breast reconstruction may be breast oncology surgeons or plastic surgeons. (Surgeons trained in both these specialities are known as oncoplastic surgeons.) Some breast surgeons also do cosmetic breast surgery.