Annotation. Rationale. Megaureter (MG) is a severe pathology of the urinary system. According to the World Health Organization, malformations of the urinary system in children occupy one of the leading places among the pathologies of all organs and systems in terms of the number and structure of diseases. Megaureter accounts for up to 40% of diseases in this group according to various authors. Violation of urodynamic indicators contribute to the development of chronic obstructive pyelonephritis, which can lead to chronic renal failure in 23-27% of cases in children. An increase in the number of early diagnosis of this disease, the use of various diagnostic methods, the presence of a large number of surgical treatment methods, and a high percentage of unsatisfactory results make this disease an urgent issue in pediatric surgery.