Altered Monocyte and Lymphocyte Phenotypes Associated with Pathogenesis and Clinical Efficacy of Progestogen Therapy for Peritoneal Endometriosis in Adolescents.

: Immunological imbalances characteristic of endometriosis may develop as early as the primary manifestations of the disease in adolescence. : To evaluate subpopulation dynamics of monocytes and lymphocytes in peripheral blood and peritoneal fluid of adolescents with peritoneal endometriosis at diagnosis and after 1-year progestogen therapy. : This study included 70 girls, 13-17 years old, diagnosed laparoscopically with peritoneal endometriosis ( = 50, main group) or paramesonephric cysts ( = 20, comparison group).