title: Incidence of retrorenal colon during percutaneous nephrolithotomy.
abstract: OBJECTIVE
  The aim of this study was to investigate retrorenal colon incidence in percutaneous nephrolithotomy (PNL) interventions made in our clinic.
  
  
  METHODS
  Clinical data of 804 PNL patients, accumulated over a 7 year period (2006-2012), was surveyed. The patient files were reviewed retrospectively, and only those who had abdominal computed tomography (CT) images before PNL intervention were included in the study. In the CT images, the position of both the ascending and descending colon in relation to the right and left kidneys were evaluated.
  
  
  RESULTS
  According to our hospital reports, 394 patients with CT images were included in the present study 27 patients (6.9%) had retrorenal colon, of which 18 (4.6%) were on the left side, 4 (1.0%) on the right side and 5 (1.3%) had bilateral retrorenal colons. Colonic perforation complication was seen only in two patients and the colonic perforation rate was 0.3%. These two cases had no CT images.
  
  
  CONCLUSIONS
  PNL, in the process of becoming the standard treatment modality, is a safe and reliable technique for renal stone treatment. Colonic injury should be taken into consideration during PNL interventions of the lower pole of the kidney (especially on the left side) due to the location of retrorenal colon.
authors.affiliation: Department of Urology, Necmettin Erbakan University Meram Medical School, Konya, Turkey.
authors.forename: Mehmet
authors.initials: M
authors.lastname: Balasar
authors.affiliation: Department of Urology, Necmettin Erbakan University Meram Medical School, Konya, Turkey.
authors.forename: Abdülkadir
authors.initials: A
authors.lastname: Kandemir
authors.affiliation: Department of Urology, Necmettin Erbakan University Meram Medical School, Konya, Turkey.
authors.forename: Necdet
authors.initials: N
authors.lastname: Poyraz
authors.affiliation: Department of Urology, Necmettin Erbakan University Meram Medical School, Konya, Turkey.
authors.forename: Yunus
authors.initials: Y
authors.lastname: Unal
authors.affiliation: Department of Urology, Necmettin Erbakan University Meram Medical School, Konya, Turkey.
authors.forename: Ahmet
authors.initials: A
authors.lastname: Ozturk
mesh_terms: D000328:Adult; D003106:Colon / Q000033:anatomy & histology* / Q000000981:diagnostic imaging / Q000293:injuries*; D005260:Female; D006801:Humans; D007416:Intestinal Perforation / Q000209:etiology; D007431:Intraoperative Complications / Q000209:etiology; D007668:Kidney / Q000033:anatomy & histology* / Q000000981:diagnostic imaging / Q000293:injuries; D007669:Kidney Calculi / Q000601:surgery; D008297:Male; D008499:Medical Records; D009403:Nephrostomy, Percutaneous / Q000009:adverse effects* / Q000379:methods; D016684:Prone Position; D012189:Retrospective Studies; D012307:Risk Factors; D014057:Tomography, X-Ray Computed