Anomalies to urine of secretory system are most frequent of all congenital developmental anomalies; their value variously. The some people appear the reason of fetal destruction of a fetus or mors at early children's age, others do not cause some appreciable disturbances of function to urine of secretory system and are found out casually. The part of anomalies differs slow advance and clinically can be shown only in advanced age. Some anomalies to urine of secretory system can be contributing factors of occurrence of a nephrolithiasis, a chronic pyelonephritis, an arterial hypertensia. Among the established reasons of formation of anomalies - hereditary factors, some diseases of mother (for example, a rubella in the first months of pregnancy), influence of an ionizing radiation, a lues, an alcoholism, the use of hormonal contraceptives, etc. At detection of anomaly it is necessary for urine of secretory system to lead careful inspection of all members of family of the patient. Distinguish following groups of anomalies to urine of secretory system: anomalies of quantity of kidneys - a bilateral agenesia, a unilateral agenesia (a unique kidney), a double kidney; anomalies of position of kidneys, a S-shaped, L-shaped kidney, anomalies of size and structure of kidneys - an aplasia, a hypoplasia; a polycystic kidney; anomalies of ureters - cysts, diverticulums, anomalies of number, calibre, the form, position of ureters.