title: Unilateral hydronephrosis in infants: are measurements of contralateral renal length useful?
abstract: OBJECTIVE
  We investigated whether measurement of contralateral renal length in newborns with unilateral hydronephrosis may help to assess clinically significant hydronephrosis in the affected kidney.
  
  
  METHODS
  We reviewed our experience with 53 newborns who had unilateral hydronephrosis presumed secondary to ureteropelvic junction obstruction. We divided the patients according to the presence of mild hydronephrosis and no obstruction on a furosemide renogram, severe hydronephrosis and obstruction on a furosemide renogram or a unilateral multicystic kidney.
  
  
  RESULTS
  We found no significant correlation between findings on the affected and opposite normal sides. Contralateral hypertrophy, hypotrophy and normal sized kidneys were frequent findings.
  
  
  CONCLUSIONS
  We conclude that measurement of contralateral renal length is not helpful in the evaluation of newborns with unilateral hydronephrosis.
authors.affiliation: Department of Pediatric Urology, Children's Hospital, Vanderbilt University Medical Center, Nashville, Tennessee, USA.
authors.forename: R A
authors.initials: RA
authors.lastname: Brandell
authors.forename: J W
authors.initials: JW
authors.lastname: Brock
authors.forename: B D
authors.initials: BD
authors.lastname: Hamilton
authors.forename: P C
authors.initials: PC
authors.lastname: Cartwright
authors.forename: B W
authors.initials: BW
authors.lastname: Snow
mesh_terms: D006801:Humans; D006869:Hydronephrosis / Q000175:diagnosis*; D007231:Infant, Newborn; D007668:Kidney / Q000000981:diagnostic imaging / Q000473:pathology*; D014463:Ultrasonography; D014517:Ureteral Obstruction / Q000175:diagnosis*