results oF tHe treatment oF ConGenital HYdronePHrosis a b s t r a C t -The paper evaluates the results of treatment in 92 children with congenital hydronephrosis of grades II and III. Plastic surgery of the adjuvant segment was performed in 67 patients using the Anderson-Hynes-Kucera pyeloplasty, while minimally invasive endoscopic treatment was performed in 25 patients. To diagnose nephrosclerosis in children with hydronephrosis and connective tissue dysplasia, urinary nephrosclerosis factor (TGF-β1) and glycosaminoglycans were studied. Static nephroscintigraphy revealed changes in the contralateral organ with unilateral lesion. K E y w o r d s -congenital hydronephrosis, minimally invasive endoscopic treatment, nephrosclerosis, connective tissue dysplasia, children.