Historical information is given about the study of the functions of the spleen, changes in the body that occur after a splenectomy, methods of diagnosis and treatment, many years of experience in the treatment of this serious injury in the children's surgical center .. Minsk . Developed classification, algorithm for diagnosis and treatment of closed spleen injuries. Special attention is paid to conservative treatment. A new method for assessing the degree of blood loss to the abdominal cavity using a prognostic coefficient is described, clear indications for laparoscopy, autohemotransfusion, laparotomy. are given The developed method of transplantation of spleen tissue into the duplicature of a large sepal is also given when it is impossible to preserve the spleen (scratching). Long-term results of treatment . Designed for graduate students and residents, pediatric surgeons, general surgeons, pediatricians, radiation diagnostics doctors, students of medical universities .