Comparative analysis of the results of videothoracoscopic parasternal lymphadenectomy and standard mastectomy by Urban--Holdin is presented. In November 1995 to December 1999 205 videothoracoscopic parasternal lymphadenectomies were performed (96--on the left, 104--on the right). Central and medial location of breast cancer was indication for this operation. Age of the patients ranged from 23 to 73 years. Surgery was performed under intravenous anesthesia in the conditions of artificial lung ventilation with separate lung intubation. Mastectomy was performed as the first stage. Further, thoracoports were introduced into pleural cavity in the 5th intercostal space along medioclavicular and mediaxillar lines and in the 4th intercostal space along anterior axillar line. Parietal pleurotemy was performed parallely to internal thoracic vessels, parasternal fat and lymph nodes were removed en-block. Parasternal lymph nodes were involved in 40 (19.5%) patients. The spirometry, cardiomonitoring which were used pre-, intra-, postoperatively demonstrated that parasternal thoracoscopic lymphadenectomy is less traumatic and effective as diagnostic method than mastectomy by Urban--Holdin. Parasternal thoracoscopic lymphadenectomy can be recommended as a method of choice in medial and central breast cancer.