After benign breast lump removal, are your breasts misshappen?

Usually not: Benign or malignant, the lump created by a tumor "does not belong" in the breast; it's removal should theoretically return the breast to normal. The degree of deformity created by surgery depends on the amout of normal tissue disrupted & the location of the incision. An experienced breast surgeon can do this operation with minimal cosmetic deformity. We even have a name for it: oncoplastics.