title: Yo-yo reflux in an incomplete duplex system causing severe hydronephrosis in a patient with contralateral renal agenesis.
abstract: This is a report of a case of a 26-year-old patient suffering from progressive renal insufficiency with a neurogenic bladder disorder due to a lipomyelomeningocele. She had renal agenesis on the left side and grade III hydronephrosis of both segments of a right duplex kidney with a bifid ureter joining further distal to the kidney. Both ureters were dilated. The cause was found to be a yo-yo reflux between the two halves of the kidney. Following bladder augmentation and pyelopyelostomy, renal insufficiency improved to stage III and has now been stable for four years. Due to the contralateral renal agenesis, the case is a unique illustration of the functional effect of the yo-yo reflux and pyelopyelostomy.
authors.affiliation: Department of Neurology, Innsbruck Medical University, Innsbruck, Austria.
authors.forename: Peter
authors.initials: P
authors.lastname: Rehder
authors.forename: Johannes
authors.initials: J
authors.lastname: Petersen
authors.forename: Karin J
authors.initials: KJ
authors.lastname: Hofmann
authors.forename: Claudia
authors.initials: C
authors.lastname: Schenk
authors.forename: Thomas
authors.initials: T
authors.lastname: Trieb
authors.forename: Bernhard
authors.initials: B
authors.lastname: Glodny
mesh_terms: D000015:Abnormalities, Multiple; D000328:Adult; D005260:Female; D006801:Humans; D006869:Hydronephrosis / Q000209:etiology*; D007668:Kidney / Q000002:abnormalities*; D012720:Severity of Illness Index; D014513:Ureter / Q000002:abnormalities*; D014718:Vesico-Ureteral Reflux / Q000150:complications*