The purpose of this epidemiological study is data for incidence of external genitalia anomaly in Korean male infants.
148 cases with external genitalia anomaly were found of total 1920 live male infants (including 132 low birth weights), except 48 still births, born in the hospital of Ewha Woman’s University.
The following results were obtained.
1. Total incidence of congenital anomaly was 7.5%. Undescended testes (4.5%), hydrocele (2.8%), hypospadia (0.2%) and bifid scrotum (0.1%) were found in order in frequency.
2. Imperfect descent of the testis was found in 88 infants. There were about 32.5% in infant under 2,500gm and about 2.5% in infant over 2,500gm. In 47 boys (30 low birth weights or 64% of the total) the imperfect descent was bilateral, and in 41 (29 low birth weights or 29% of the total) it was unilateral. Of the 41 unilateral cases, 22 were right sided. 54% of the total had been palpable at the external inguinal ring, 37% at the top of the scrotum and 10% had been not palpable.
There were no significant differences either between distribution of birth order and incidence of undescended testes. But, their incidence was higher below 19 year-old group and above 35 year-old group in maternal age.
Between March and May more boys were born with undescended testis, while their occurrence was considerably lower in November.
3. 90% of hydrocele was found in full term and right side had six times greater than left side.
4. Hypospadia was found in 4 cases of 1920 live male births. The associated anomalies were undescended testes in two cases and imperforate anus in one case. In the 2 cases, it was found at penoscrotal junction and 2 cases were glandular and penile type.
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