title: Fibromuscular tissue complex in the pyeloureteral segment as a cause of idiopathic hydronephrosis.
mesh_terms: D006801:Humans; D006869:Hydronephrosis / Q000209:etiology* / Q000473:pathology; D007682:Kidney Pelvis / Q000648:ultrastructure*; D009130:Muscle, Smooth / Q000648:ultrastructure; D014513:Ureter / Q000648:ultrastructure*