Analysis of shape and retractability of the prepuce in 603 Japanese boys

J Urol. 1996 Nov;156(5):1813-5.


Purpose: We evaluated preputial development in Japanese boys.

Materials and methods: Preputial retractability and formation of a tight ring were evaluated in 603 Japanese boys 0 to 15 years old.

Results: The incidence of a completely retractable prepuce gradually increased from 0% at age 6 months to 62.9% by 11 to 15 years, while that of a tight ring decreased with age from 84.3 to 8.6%. Nine boys had balanoposthitis but none had a symptomatic urinary tract infection.

Conclusions: Incomplete separation of the prepuce is common and normal in neonates and infants, and preputial separation progresses until adolescence. Awareness of these findings will eliminate unnecessary circumcision in boys.

MeSH terms

  • Adolescent
  • Child
  • Child, Preschool
  • Humans
  • Infant
  • Infant, Newborn
  • Japan
  • Male
  • Penis / growth & development*
  • Penis / physiology*