title: Age-related differences in internal prostatic architecture on transrectal ultrasonography: results of a community based survey in Japan.
abstract: OBJECTIVE
  We determined age-related differences in prostate internal architecture and prostate volume by transrectal ultrasonography in Japanese men 40 to 79 years old.
  
  
  METHODS
  The 287 study participants were categorized by transition zone disease: group 1-not visible (normal prostate), group 2-visible, borders unclear (diffusely enlarged hyperplasia) and group 3-visible, border clear (nodularly enlarged hyperplasia).
  
  
  RESULTS
  Group 1 comprised 40% of men 50 to 79 years old and showed slightly decreased median prostate volume with age. Prostate volume and its variance increased with age in group 3 but differed little across age in group 2.
  
  
  CONCLUSIONS
  In a community sample the prostatic internal architecture relationship with age and prostate volume suggested differing growth patterns.
authors.affiliation: Department of Urology, Sapporo Medical University School of Medicine, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Masumori
authors.forename: T
authors.initials: T
authors.lastname: Tsukamoto
authors.forename: Y
authors.initials: Y
authors.lastname: Kumamoto
authors.forename: H
authors.initials: H
authors.lastname: Miyake
authors.forename: T
authors.initials: T
authors.lastname: Rhodes
authors.forename: C J
authors.initials: CJ
authors.lastname: Girman
authors.forename: H A
authors.initials: HA
authors.lastname: Guess
authors.forename: S J
authors.initials: SJ
authors.lastname: Jacobsen
authors.forename: M M
authors.initials: MM
authors.lastname: Lieber
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D006801:Humans; D007564:Japan; D008297:Male; D008875:Middle Aged; D011470:Prostatic Hyperplasia / Q000000981:diagnostic imaging* / Q000473:pathology*; D012007:Rectum; D014463:Ultrasonography / Q000379:methods