title: [Two methods for transrectal ultrasound-guided biopsy of the prostate: systematic vs. guided for suspect echogenic lesion].
abstract: OBJECTIVE
  We undertook this study to determine the efficiency of ultrasound-guided transrectal prostate biopsy applying two techniques: systematic extended vs. suspicious sonographic areas.
  
  
  METHODS
  Medical files and histopathological reports were reviewed of patients who were treated at the Specialties Hospital of the 21st Century Medical National Center in Mexico City with suspicion of prostate cancer (T1, T2 and PSA <10 ng/ml). Patients had ultrasound-guided transrectal prostate biopsy applying two techniques: systematic extended vs. hypoechoic suspicious sonographic areas. Studies were carried out from January 1, 2005 to July 2006.
  
  
  RESULTS
  Of 145 selected patients submitted to ultrasound-guided transrectal prostate biopsy, systematic extended biopsy (group I) was carried out in 73 (50.3%), taking on average 11.75 cylinders per patient. In 72 (49.6%) patients, biopsies were taken on suspicious sonographic areas (group II), taking on average 4.02 cylinders. In group I, 36 (49.3%) patients were positive vs. group II, where 20 (27.7%) patients were positive (p <0.01) with an estimation of risk in favor of group I, determining a probability 2.5 times higher of positivity with this technique (95% confidence interval: range 1.2-5) and a better performance in 22%.
  
  
  CONCLUSIONS
  Systematic extended ultrasound-guided transrectal prostate biopsy represents a technique with a higher rate of efficiency than using ultrasound-guided transrectal prostate biopsy in suspicious sonographic areas and has proven over time to be the superior prostate biopsy technique for diagnosis of prostate cancer. It must be considered the method of choice.
authors.affiliation: Departamento de Urología, Hospital de Especialidades, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, México. eserranob@hotmail.com
authors.forename: Eduardo
authors.initials: E
authors.lastname: Serrano-Brambila
authors.forename: Virgilio Augusto
authors.initials: VA
authors.lastname: López-Sámano
authors.forename: Guillermo
authors.initials: G
authors.lastname: Montoya-Martínez
authors.forename: Xavier
authors.initials: X
authors.lastname: Espinoza-Guerrero
authors.forename: Juventino
authors.initials: J
authors.lastname: González-Pérez
authors.forename: Andrés
authors.initials: A
authors.lastname: Martínez-Cornelio
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001707:Biopsy, Needle / Q000379:methods*; D015331:Cohort Studies; D003430:Cross-Sectional Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D011467:Prostate / Q000000981:diagnostic imaging* / Q000473:pathology*; D011471:Prostatic Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology*; D012007:Rectum; D012189:Retrospective Studies; D014463:Ultrasonography