The authors have analyzed the results of the treatment of benign ovarian cysts with 30-49mm (group I) or more than 50mm in diameter (group II). 40 patients were treated with progestogen, 41 with contraceptive pill, and another 48 patients were only observed without any treatment (control group). Ovarian cyst regression was observed in 84.6% of patients in group I, and in 83.3% of patients in group II; 85.4% of patients in group I and 88.9% of patients in group II were treated with contraceptive pill; 92.5% of patients in group I and 93.1% of patients in group II were treated with progestogen. The authors have concluded that hormone treatment is not necessary to induce functional regression of ovarian cysts.