Ethanol Sclerotherapy Prior to ART

2 gr IV cefazolin sodium will be administered 30 minutes before the procedure. The endometrioma cyst content will be aspirated by a single lumen needle, and the total aspirated volume calculation will be done. The endometrioma will then be washed with saline until the color of the cyst content becomes clear. Then, 96% ethanol will be injected into the cyst. The volume of injected ethanol will be 60% of the first aspirated volume (maximum 100 ml). After 10 minutes all ethanol will be aspirated.