AIM OF THE STUDY: The Authors intend to guide the choice of surgical treatment for mammary asymmetry, according to specific form of asymmetry. MATERIAL AND METHODS: Possible types of symmetryzation surgery are listed. First Author’s personal technique is described and some clinical cases are presented. DISCUSSION: Regardless to specific surgical needs for the single case, a generally valid concept is the necessity of a surgical moulding meant to obtain the same volume for both breasts before positioning of implants. This allows a longer lasting symmetry between breasts, as aging modifications bilaterally occur at equal speed if the adipo-glandular structures obtained have the same volume.