title: Hydronephrosis after retroperitoneal laparoscopic dismembered Anderson-Hynes pyeloplasty in adult patients with ureteropelvic junction obstruction: A longitudinal analysis.
abstract: OBJECTIVE
  We evaluated the improvement of hydronephrosis longitudinally after laparoscopic dismembered Anderson-Hynes pyeloplasty in adult patients with ureteropelvic junction obstruction.
  
  
  METHODS
  Sixteen patients underwent laparoscopic pyeloplasty at our institution between January 2006 and June 2012. Hydronephrosis was assessed by ultrasound and intravenous pyelography at 3, 6, 12, 18, and 24 months after pyeloplasty.
  
  
  RESULTS
  The mean follow-up time was 24 months. Preoperative hydronephrosis was diagnosed as grade 2 and grade 3 in 8 patients each. Postoperative improvement of the hydronephrosis by one grade was observed in 56%, 73%, 67%, 50%, and 40% of patients at 3, 6, 12, 18, and 24 months, respectively. Improvement of the hydronephrosis by two grades was observed in 6%, 27%, 33%, 50%, and 60% of patients at 3, 6, 12, 18, and 24 months, respectively. In 5 of 12 patients (42%), hydronephrosis was still improving even after 12 months postoperatively.
  
  
  CONCLUSIONS
  Adult patients demonstrate relatively rapid improvements in the degree of hydronephrosis after laparoscopic pyeloplasty and continue to improve for a long time.
authors: Division of Urology, Department of Surgery, Tottori University Faculty of Medicine, Yonago, Japan.
authors: Tadahiro
authors: T
authors: Isoyama
authors: Division of Urology, Department of Surgery, Tottori University Faculty of Medicine, Yonago, Japan.
authors: Hideto
authors: H
authors: Iwamoto
authors: Division of Urology, Department of Surgery, Tottori University Faculty of Medicine, Yonago, Japan.
authors: Seiya
authors: S
authors: Inoue
authors: Division of Urology, Department of Surgery, Tottori University Faculty of Medicine, Yonago, Japan.
authors: Shuichi
authors: S
authors: Morizane
authors: Division of Urology, Department of Surgery, Tottori University Faculty of Medicine, Yonago, Japan.
authors: Nobuyuki
authors: N
authors: Hinata
authors: Division of Urology, Department of Surgery, Tottori University Faculty of Medicine, Yonago, Japan.
authors: Akihisa
authors: A
authors: Yao
authors: Division of Urology, Department of Surgery, Tottori University Faculty of Medicine, Yonago, Japan.
authors: Masashi
authors: M
authors: Honda
authors: Division of Urology, Department of Surgery, Tottori University Faculty of Medicine, Yonago, Japan.
authors: Takehiro
authors: T
authors: Sejima
authors: Division of Urology, Department of Surgery, Tottori University Faculty of Medicine, Yonago, Japan.
authors: Atsushi
authors: A
authors: Takenaka
keywords: adult; hydronephrosis; laparoscopy; pelviureteric junction obstruction; pyeloplasty; ultrasonography