title: Unenhanced spiral CT in acute ureteral colic: a replacement for excretory urography?
abstract: OBJECTIVE
  To compare the usefulness of unenhanced spiral CT (UCT) with that of excretory urography (EU) in patients with acute flank pain.
  
  
  METHODS
  Thirty patients presenting with acute flank pain underwent both UCT and EU. Both techniques were used to determine the presence, size, and location of urinary stone, and the presence or absence of secondary signs was also evaluated. The existence of ureteral stone was confirmed by its removal or spontaneous passage during follow-up. The absence of a stone was determined on the basis of the clinical and radiological evidence.
  
  
  RESULTS
  Twenty-one of the 30 patients had one or more ureteral stones and nine had no stone. CT depicted 22 of 23 calculi in the 21 patients with a stone, and no calculus in all nine without a stone. The sensitivity and specificity of UCT were 96% and 100%, respectively. EU disclosed 14 calculi in the 21 patients with a stone and no calculus in eight of the nine without a stone. UCT and EU demonstrated secondary signs of ureterolithiasis in 15 and 17 patients, respectively.
  
  
  CONCLUSIONS
  For the evaluation of patients with acute flank pain, UCT is an excellent modality with high sensitivity and specificity. In near future it may replace EU.
authors.affiliation: Department of Radiology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
authors.forename: J A
authors.initials: JA
authors.lastname: Ryu
authors.forename: B
authors.initials: B
authors.lastname: Kim
authors.forename: Y H
authors.initials: YH
authors.lastname: Jeon
authors.forename: J
authors.initials: J
authors.lastname: Lee
authors.forename: J W
authors.initials: JW
authors.lastname: Lee
authors.forename: S S
authors.initials: SS
authors.lastname: Jeon
authors.forename: K H
authors.initials: KH
authors.lastname: Park
mesh_terms: D000328:Adult; D003085:Colic / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed / Q000379:methods*; D014514:Ureteral Calculi / Q000000981:diagnostic imaging*; D014515:Ureteral Diseases / Q000000981:diagnostic imaging*; D014567:Urography