The reason of post-operative introital stenosis in girls with CAH is a poor estrogenization of external genitalia before vaginoplasty. It is possible that the local sensitivity to estrogens can be reduced due to prenatal androgen excess in addition to inadequate compensation, which results to decrease of estrogens production by the ovaries. Objective. To determine the distribution of estrogen and androgen receptors in genital tissue, depending on the form of CAH, the degree of external virilization and serum levels of androgens. Material and methods. The waste surgical tissues obtained during routine feminizing genitoplasty (clitoro- and vaginoplasty) was used for immunohistochemical study of estrogen (α and β) and androgen receptors in girls with CAH (n=13 and n=8, respectively). Results. The expression of estrogen (α, β) and androgen receptors was determined in genital tissues of girls with CAH. There was no significant correlation between the number of immunopositive cells in the tissues of labia minora and vagina and the degree of virilization, as well as between the number of cells expressing the receptors and serum levels of androgens (testosterone, 17-hydroxyprogesterone). There was no difference in the expression of estrogen and androgen receptors between girls with salt-wasting and simple virilizing forms of CAH. The expression of estrogen receptor α in vaginal tissues was reduced in girls who underwent repeated vaginoplasty and were under preoperative local estrogen therapy in comparison to patients in whom the vaginoplasty was performed for the first time (p=0.045). Conclusion. The distribution of estrogen and androgen receptors in the labial and vaginal tissues in girls with CAH doesn’t depend on the form of disease, external virilization and serum levels of androgens. Girls undergoing repeated vaginoplasty may have a reduced sensitivity to local estrogen therapy due to decrease of estrogen receptors expression in the vaginal mucosa.

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