[On congenital valves of urethra posterior as a cause of hydronephrosis; case report].
D006801:Humans; D006869:Hydronephrosis / Q000209:etiology*; D008297:Male; D014521:Urethra / Q000002:abnormalities*
HYDRONEPHROSIS/etiology and pathogenesis; URETHRA/abnormalities
Uber die Hydronephrose verursachenden kongenitalen Klappen der Urethra posterior, an Hand des Falles eines 15 jährigen Knaben.