The publication presents the data on the beginning of a pilot study to assess the effectiveness of prevention of intraoperative bleeding in placenta ingrowth using temporary balloon occlusion of the aorta under the control of contact ultrasound duplex scanning, conducted by a multidisciplinary team of the Moscow Region State Budgetary Institution “Moscow Regional Research Institute of Obstetrics and Gynecology named after Academician V.I. Krasnopolsky” of the Ministry of Health of the Moscow Region and the State Budgetary Institution “Research Institute of Emergency Care named after N.V. Sklifosovsky” of the Department of Health of Moscow. N.V. Sklifosovsky Emergency Medical Research Institute of the Moscow City Health Department. We present a series of three clinical observations with successful application of this technology in patients with antenatally diagnosed and intraoperatively confirmed placenta percreta ingrowth (PAS 2/FIGO 3b) with invasion into the posterior wall of the bladder, cervix and posterior wall of the uterus. In all observations, contact ultrasound duplex scanning was used to ensure balloon placement in zone 3 of the abdominal aorta. The duration of aortic occlusion ranged from 15 to 24 min. Effective reduction of uterine blood flow made it possible to perform organ-preserving surgeries for the most severe types of placental ingrowth with blood loss volume of 497—1517 ml. No postoperative complications were recorded in any observation. These first clinical observations emphasize the safety and efficacy of temporary balloon aortic occlusion under the control of contact ultrasound duplex scanning in patients with placental ingrowth. Implementation of this technology can be proposed for various institutions without X-ray operating rooms, but facing the necessity of delivery of patients with placental ingrowth, especially in case of suspicion of extensive collateral blood flow in the areas of abnormal invasion.