Introduction. Surgery remains the main method of treatment for breast cancer patients. However, in surgery a large number of lymphatic vessels are crossed which inevitably leads to a lymph flow damage. The article discusses the problem of lymphorrhea in breast cancer patients after the radical mastectomy and radical resection. The aim of the study was to assess the effectiveness of minor pectoral myoplasty in the axillary region of the "dead space" for lymphorrhea prevention after radical mastectomy and radical resection.Methods. The case group included 30 patients who underwent 30 surgeries with myoplasty of pectoralis minor (Maddens radical mastectomy or radial resection) in the Tver Oncological Center at the Department of breast pathology from 2016 to 2017. The control group included 30 patients who underwent Maddens mastectomy or radical resection without myoplasty (conventional option).Results. In the case group, during the mastectomy, the patients with lymphorrhea had the drainage removed on the 5,31,2 day. The total amount of the drainage was around 235,43,6 ml. The average daily volume of the drained liquid was 47,12,7 ml. In the control group, during the radical mastectomy without myoplasty, the drainage was removed on the 12,71,4 day. The average total amount of the drained liquid was 1691,632,5 ml. The average daily drained volume was 130,32,5 ml.The patients after radical resection in the case group had the drainage removed on the 5,21,2 day. The total amount of the drained liquid in patients with lymphorrhea was 25 ml/day. The total amount of the drained liquid was 223,711,3 ml. The average daily drained volume was 44,62,3 ml. The patients after radical resection in the control group had the drainage removed on the 11,22,0 day. The average total volume of the drained liquid was 835,526,4 ml. The average daily drained volume was 69,92,2 ml.Conclusion. Application of A. Kh. Ismagilov intraoperative technique dead space closure in minor pectoral myoplasty (patent No. 2385673, issued April 10, 2010) with the simultaneous application of compression garments appears to be a simple and effective method for reducing postoperative lymphorrhea. Myoplasty was effective in reducing lymphorrhea regardless of the type of surgical intervention (radical mastectomy or radical resection). Lymphorrhea duration reduced in more than 2 times.