Megacalyces.
D000293:Adolescent; D000328:Adult; D000792:Angiography; D003937:Diagnosis, Differential; D006801:Humans; D006869:Hydronephrosis / Q000175:diagnosis; D007668:Kidney / Q000002:abnormalities / Q000000981:diagnostic imaging / Q000503:physiopathology; D007682:Kidney Pelvis / Q000002:abnormalities* / Q000196:embryology; D008297:Male; D008875:Middle Aged; D014567:Urography