General: Determine the impact of Dienogest to 2 mg / day compared with combined oral contraceptives (levonorgestrel + ethinyl estradiol 0.10 mg - 0.02 mg / day) in the treatment of endometriomas diagnosed by transvaginal ultrasound in women with smaller diameters 4 centimeters thereof, at University Hospital Fundación Santa Fe de Bogota.