title: Proportional analysis of the pig renal parenchyma and sinus structures.
abstract: OBJECTIVE
  This study was performed to determine the proportion of the parenchyma and sinus structures of pig kidneys and the distance between the collecting system and the kidney surface.
  
  
  METHODS
  Forty-one pig kidneys were analyzed. Cavalieri's principle was used to obtain the volume of the cortex, medulla and sinus, as well the proportions of the arteries, veins and collecting system in the sinus.
  
  
  RESULTS
  The volume of the renal parenchyma varied from 129 to 488.4 cm(3). The renal cortex was 83.79% and the medulla 16.21%. The collecting system occupied the greatest part of the sinus, ranging from 34.78 to 71.91% of the renal sinus. The collecting system was closer to the dorsal than to the ventral surface in the cranial pole (p < 0.001) and the hilar zone (p < 0.01). The distance from the collecting system to the medial border was shorter than that to the lateral border in the caudal pole (p < 0.001).
  
  
  CONCLUSIONS
  With this new information about the variation in thickness of the pig renal parenchyma, continued studies using the pig model are needed to support the use of radiofrequency ablation and cryoablation in deep and large renal tumors with a component in the renal sinus.
authors.affiliation: Urogenital Research Unit, State University of Rio de Janeiro, Rio de Janeiro, Brazil. sampaio@vm.uff.br
authors.forename: Marco A
authors.initials: MA
authors.lastname: Pereira-Sampaio
authors.forename: Robert W
authors.initials: RW
authors.lastname: Henry
authors.forename: Luciano A
authors.initials: LA
authors.lastname: Favorito
authors.forename: Francisco J B
authors.initials: FJ
authors.lastname: Sampaio
mesh_terms: D000818:Animals; D003452:Cryosurgery; D003972:Diathermy; D005260:Female; D006801:Humans; D007668:Kidney / Q000033:anatomy & histology* / Q000098:blood supply; D007672:Kidney Cortex / Q000033:anatomy & histology; D007679:Kidney Medulla / Q000033:anatomy & histology; D007680:Kidney Neoplasms / Q000473:pathology / Q000628:therapy; D007685:Kidney Tubules, Collecting / Q000033:anatomy & histology; D008297:Male; D008953:Models, Anatomic; D023421:Models, Animal; D009929:Organ Size; D000078702:Radiofrequency Therapy; D034421:Sus scrofa / Q000033:anatomy & histology*