title: Non-contrast-enhanced MR angiography using time-spin labelling inversion pulse technique for detecting crossing renal vessels in children with symptomatic ureteropelvic junction obstruction: comparison with surgical findings.
abstract: OBJECTIVE
  Investigate the feasibility and evaluate the accuracy of non-contrast-enhanced MR angiography (NC-MRA) using time-spin labelling inversion pulse (time-SLIP)to identify crossing renal vessels (CRVs) in children requiring surgical treatment of ureteropelvic junction (UPJ) obstructionand compare to laparoscopic findings.
  
  
  METHODS
  Nineteen children ranging from 6 to 16 years of age underwent NC-MRA using the time-SLIP technique before surgery. Two independent readers analysed the MRA images. Number of renal arteries and presence or absence of CRVs were identified and compared with surgicalfindings. Image quality was assessed, as well as the presence of CRVs and measurement of renal pelvis diameter. Intra and inter-reader agreement was calculated using Cohen's kappa coefficient and Bland-Altman plots.
  
  
  RESULTS
  The overall image quality was fair or good in 88% of cases. NC-MRA demonstrated CRVs at the level of the obstruction in 10 children and no CRV in 9 children. All were confirmed intra-operatively except in one of the nine children. Sensitivity, specificity, NPV, PPV for predicting CRVs were 92%, 100%, 100% and 87.5%, respectively, for both readers.
  
  
  CONCLUSIONS
  NC-MRA is a good alternative to contrast-enhanced MRA and CT scanning for identifying CRVs in children with symptomatic UPJ.
  
  
  CONCLUSIONS
  • Time-SLIP technique offers acceptable imaging quality for identifying crossing renal vessel. • Time-SLIP technique is easy to apply to the renal MRA examination. • Time-SLIP technique is an alternative to contrast-enhanced MRA and CT scanning.
authors.affiliation: Department of Radiology, University Hospital Centre of Toulouse Purpan, Place du Docteur Baylac, TSA 40031, 31059, Toulouse, France. brucher.n@chu-toulouse.fr.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Brucher
authors.affiliation: Department of Radiology, University Hospital Centre of Toulouse Purpan, Place du Docteur Baylac, TSA 40031, 31059, Toulouse, France.
authors.forename: Julie
authors.initials: J
authors.lastname: Vial
authors.affiliation: Department of Radiology, University Hospital Centre of Toulouse Purpan, Place du Docteur Baylac, TSA 40031, 31059, Toulouse, France.
authors.forename: Christiane
authors.initials: C
authors.lastname: Baunin
authors.affiliation: Department of Radiology, University Hospital Centre of Toulouse Purpan, Place du Docteur Baylac, TSA 40031, 31059, Toulouse, France.
authors.forename: David
authors.initials: D
authors.lastname: Labarre
authors.affiliation: Department of Radiology, University Hospital Centre of Toulouse Rangueil, 1 avenue du Pr Jean Poulhès, TSA 50032, 31059, Toulouse, France.
authors.forename: Olivier
authors.initials: O
authors.lastname: Meyrignac
authors.affiliation: Department of Paediatric Surgery, Clinique Sarrus Teinturiers, 49 Allée Charles de Fitte, 31300, Toulouse, France.
authors.forename: Michel
authors.initials: M
authors.lastname: Juricic
authors.affiliation: Department of Paediatric Surgery, University Hospital Centre of Toulouse Purpan, Hôpital des enfants. 330 avenue de Grande-Bretagne, TSA 70034, 31059, Toulouse, France.
authors.forename: Ourdia
authors.initials: O
authors.lastname: Bouali
authors.affiliation: Department of Paediatric Surgery, University Hospital Centre of Toulouse Purpan, Hôpital des enfants. 330 avenue de Grande-Bretagne, TSA 70034, 31059, Toulouse, France.
authors.forename: Olivier
authors.initials: O
authors.lastname: Abbo
authors.affiliation: Department of Paediatric Surgery, University Hospital Centre of Toulouse Purpan, Hôpital des enfants. 330 avenue de Grande-Bretagne, TSA 70034, 31059, Toulouse, France.
authors.forename: Philippe
authors.initials: P
authors.lastname: Galinier
authors.affiliation: Department of Radiology, University Hospital Centre of Toulouse Purpan, Place du Docteur Baylac, TSA 40031, 31059, Toulouse, France.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Sans
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007682:Kidney Pelvis / Q000000981:diagnostic imaging* / Q000601:surgery; D010535:Laparoscopy; D018810:Magnetic Resonance Angiography / Q000379:methods; D008297:Male; D012077:Renal Artery / Q000000981:diagnostic imaging*; D012680:Sensitivity and Specificity; D013113:Spin Labels; D014057:Tomography, X-Ray Computed; D014517:Ureteral Obstruction / Q000000981:diagnostic imaging* / Q000601:surgery
chemical_list: D013113:Spin Labels
keywords: Children; Crossing vessel; MR angiography; Non-contrast-enhanced; Ureteropelvic junction