title: Impact of 3-dimensional helical computerized tomography on selection of operative methods for ureteropelvic junction obstruction.
abstract: OBJECTIVE
  We studied the feasibility of imaging the direct correlation between crossing vessels and obstructed ureteropelvic junction with helical (spiral) computerized tomography (CT) for selecting surgical repair of symptomatic ureteropelvic junction obstruction.
  
  
  METHODS
  From July 1995 to December 1995, 4 select patients with symptomatic ureteropelvic junction obstruction underwent contrast enhanced helical CT. In addition to transaxial images, 3-dimensional reformatted images were used for evaluation.
  
  
  RESULTS
  We identified 2 cases of ureteropelvic junction obstruction due to crossing vessels regarded as ureterovascular hydronephrosis, which is characterized by the spatial relationship between malrotated renal pelvis and anterior crossing vessels. Laparoscopic or open repair was performed in these 2 patients and operative findings were in agreement with prospective helical CT interpretation. Antegrade endopyelotomy was performed successfully for the remaining 2 patients.
  
  
  CONCLUSIONS
  The 3-dimensional helical CT is reliable in detecting ureterovascular hydronephrosis preoperatively and in presenting better operative methods for ureteropelvic junction obstruction.
authors.affiliation: Department of Urology, Okayama University Medical School, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Kumon
authors.forename: M
authors.initials: M
authors.lastname: Tsugawa
authors.forename: H
authors.initials: H
authors.lastname: Hashimoto
authors.forename: K
authors.initials: K
authors.lastname: Yasui
authors.forename: Y
authors.initials: Y
authors.lastname: Hiraki
authors.forename: H
authors.initials: H
authors.lastname: Ohmori
mesh_terms: D000328:Adult; D005240:Feasibility Studies; D005260:Female; D006801:Humans; D007682:Kidney Pelvis / Q000000981:diagnostic imaging* / Q000601:surgery; D008297:Male; D013514:Surgical Procedures, Operative / Q000379:methods; D014057:Tomography, X-Ray Computed / Q000379:methods*; D014517:Ureteral Obstruction / Q000000981:diagnostic imaging* / Q000601:surgery