title: Renal papillary attenuation differences between primary and recurrent idiopathic calcium stone disease patients.
abstract: OBJECTIVE
  The aim of this paper was to investigate whether renal papillae of patients with nephrolithiasis are more radiodense than that of control patients and to evaluate the predictability of urolithiasis using papillary density differences between stone and non-stone formers.
  
  
  METHODS
  Renal papillary Hounsfield Unit (HU) measurements were conducted at the level of upper pole, middle region and lower pole of both kidneys in a total of 126 primary (group 1), 133 recurrent (group 2) stone disease patients and 108 controls (group 3).
  
  
  RESULTS
  Mean patient age did not differ significantly between groups (P>0.05). Mean stone diameters (±SD) were 5.0±3.1 mm (3-9 mm) and 6.1±3.3 mm (3-15 mm) for primary and recurrent groups, respectively and group distributions and variances were similar (P>0.05). Mean papillary attenuation values (±SD) were 27.26±9.30 (4.00-56.00) in group 1, 30.42±9.88 (12.00-64.00) in group 2 and 25.83±2.72 (20.30-32.56) in the control group. The difference between the mean papillary attenuation value of the primary stone disease group and the control group was statistically insignificant (P=0.104). When the control group and the recurrent stone group was compared without variances, in terms of the mean renal papillary attenuation value, a statistical significance was achieved (P=0.000).
  
  
  CONCLUSIONS
  With increasing renal papillary HU values, the risk of recurrent calcium stone disease is increased.
authors.affiliation: Hisar Intercontinental Hospital Deparment of Urology, Umraniye Istanbul, Turkey - drbasri@gmail.com.
authors.forename: B
authors.initials: B
authors.lastname: Cakiroglu
authors.forename: S E
authors.initials: SE
authors.lastname: Eyyupoglu
authors.forename: T
authors.initials: T
authors.lastname: Tas
authors.forename: T
authors.initials: T
authors.lastname: Esen
authors.forename: O
authors.initials: O
authors.lastname: Acar
authors.forename: S H
authors.initials: SH
authors.lastname: Aksoy
mesh_terms: D000328:Adult; D002129:Calcium Oxalate / Q000032:analysis; D004198:Disease Susceptibility; D005260:Female; D006801:Humans; D007669:Kidney Calculi / Q000737:chemistry / Q000000981:diagnostic imaging / Q000648:ultrastructure; D007679:Kidney Medulla / Q000000981:diagnostic imaging / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D053040:Nephrolithiasis / Q000000981:diagnostic imaging / Q000378:metabolism / Q000473:pathology*; D012008:Recurrence; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed
chemical_list: D002129:Calcium Oxalate