The authors place a great deal of emphasis on the application of plastic surgery principles in the course of all their operations, especially mammary operations: the incision planning respecting the lines of strength, the atraumatic operation technique (sharp preparation, high-frequency electrocoagulation, tensionless wound closure, and suction drainage from a separate opening). In their organ-preserving operations the radial incision recommended by Veronese is avoided, and the axilla is exposed separately. They do not perform their radical mammary operations according to the customary method (Auchincloss, Patey) either. If necessary they accomplish the tensionless closure of the wound by means of individual incision planning and the preservation (rotation and sliding) of the intact skin of the breast, which is the precondition of the reconstruction that might be performed subsequently. In the course of the follow-up of 295 operations carried out in this manner excellent or good results were obtained in 83% as far as aesthetics and functionality were concerned. Lymphedema did not develop in a single case on account of operation technique.