Congenital phimosis occurs in 96% of newborns, with the tip of the glans visible in only 50% of newborn boys. In a prospective evaluation of more than 1000 boys over 8 years of follow-up in Denmark, congenital phimosis was present in 8% of 6- to 7-year-olds. Prevalence in this group declined to 1% of 16- to 17-year-old boys. In Japan, the prevalence of congenital phimosis is reported as 88.5% in infants 1 to 3 months of age, and as 35% in boys at 3 years of age. The reported prevalence of acquired phimosis varies widely. It is likely to be secondary to inclusion of congenital phimosis in statistical analysis, but a rate of 1% of uncircumcised males is commonly reported. Paraphimosis is seen exclusively in uncircumcised or partially circumcised males. Its true incidence is unknown. Hypospadias is estimated to occur in approximately 1 in 200 males, with most patients having distal hypospadias. Congenital penile curvature >30 degrees is considered clinically significant. The estimated prevalence of congenital penile curvature and/or torsion is 0.6%. Congenital buried penis (megaprepuce) is uncommon. Its true incidence is unknown.
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