title: Congenital stenosis of ureteropelvic junction: assessment with multislice CT.
abstract: OBJECTIVE
  To assess the feasibility of Multislice spiral CT (MSCT) with volume rendering (VR) and maximum intensity projection (MIP) reconstructions in recognizing ureteropelvic junction obstruction (UPJO).
  
  
  METHODS
  Twenty-seven patients with UPJO underwent MSCT. To visualise the excretory system, 50 ml of uroangiografic contrast medium was administered by drip infusion via the cubital vein 180 minutes before the CT scan. MSCT was performed after the injection of 120 ml of contrast medium at a flow rate of 3.5 ml/sec. Dual-phase scanning was performed 25s and 55s after contrast medium administration. MIP and VR reconstructions were obtained on a dedicated workstation.
  
  
  RESULTS
  In 11/27 (41%) patients, UPJO was due to an anomalous ureteropelvic junction (UPJ). In 9/27 (33%), the stenosis was caused by anomalous vessels. In 3/27 (11%), stenosis was due to an anomalous UPJ position even though anomalous accessory vessels could be seen. In 4/27 (15%), anomalous vessels were also identified but the presence of a pyeloureteral stent did not allow us to establish whether these vessels were the cause of UPJO.
  
  
  CONCLUSIONS
  MSCT and MIP and VR reconstructions allow identification of the causes of congenital UPJO and provide useful information for appropriate treatment planning.
authors.affiliation: DiMIMP, Sezione di Diagnostica per Immagini, Policlinico Universitario di Bari, Italy. a.stabile@radiologia.uniba.it
authors.forename: Amato Antonio
authors.initials: AA
authors.lastname: Stabile Ianora
authors.forename: Arnaldo
authors.initials: A
authors.lastname: Scardapane
authors.forename: Luigi
authors.initials: L
authors.lastname: Chiumarullo
authors.forename: Roberto
authors.initials: R
authors.lastname: Calbi
authors.forename: Antonio
authors.initials: A
authors.lastname: Rotondo
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Angelelli
mesh_terms: D000328:Adult; D003287:Contrast Media; D005240:Feasibility Studies; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D021621:Imaging, Three-Dimensional; D007682:Kidney Pelvis / Q000002:abnormalities / Q000000981:diagnostic imaging*; D008297:Male; D036542:Tomography, Spiral Computed; D014513:Ureter / Q000002:abnormalities / Q000000981:diagnostic imaging*; D014517:Ureteral Obstruction / Q000151:congenital / Q000000981:diagnostic imaging*
chemical_list: D003287:Contrast Media