Gynecomastia (Man boobs) vary widely in presentation and severity and therefore require different operations to correct them. But - no operation in surgery, no even cancer operations, currently routinely remove the pectoralis major muscle. Doing so as was done when surgeons preformed Radical Mastectomies permanently deforms the chest. In the vast majority of cases liposuction and removal of a small portion of the male breast gland under the nipple complex is all it takes to nicely flatten the enlarged male breast.
Gynecomastia is cased by increased tissue in the breast. The two types of tissue which may be present are adipose tissue,which is fat and glandular tissue which is breast gland. Gynecomastia is not caused by muscular tissue,so the pectorals does not cause gynecomastia and is not removed during the surgical correction