DCIS lesion removal. Do I need fat transfer or oncoplasty? (photo)

I am a B/C cup going into surgery to remove a 6 cm DCIS lesion, (surgeon will remove 6 cm long, 1 in diameter cylinder). I am happy with my current size. I'm a bit concerned that the amount of tissue to be removed will leave my breasts out of proportion to the rest of my body (too small). I'm not sure if fat grafting will be adequate to restore my left breast to basic symmetry to my right, or if I would be better off with oncoplasty which would lift both breasts but at a smaller size.