Although most women who have a choice prefer the less invasive lumpectomy, deciding between lumpectomy and mastectomy depends on a how you feel about the following:
Do you want to keep your breast? If it’s important to you to keep your breast, you may decide to have lumpectomy with radiation instead of mastectomy.
Do you want your breasts to match as much as possible in size? For most women, lumpectomy has a good cosmetic result. In rare cases when a larger area of tissue needs to be removed, lumpectomy can cause the breast to look smaller or distorted. There are types of reconstruction available for both lumpectomy (if there is significant distortion) and mastectomy. If you need to have a large area of tissue removed and two breasts of matching size are very important to you, you and your doctor will need to decide which surgery is best for your situation.
How anxious will you be about breast cancer coming back? If removing the entire breast would help you worry less about the possibility of the breast cancer coming back (recurrence), you might consider mastectomy.