Mastectomy : removal of whole of the breast, usually along with axillary lymph nodes, which scalso known as modified radical mastectomy, in the era before widespread availability of radiation machine it was the most popular modality, patient may or may not require radiotherapy depending upon the axillary nodal involvement
Breast conservation surgery : involves removal of tumor along with sufficient margins or one of the quadrants of the breast , which is followed by adjuvant radiotherapy; BCS restores the normal female anatomy without adding any significant morbidity without compromising on the cure, it has become the preferred modality