Abstract
Endometriosis is a benign gynecologic disorder characterized by the ectopic growth of misplaced endometrial cells. The retrograde menstruation theory, also known as Sampson's theory, proposes that viable endometrial tissue is refluxed through the fallopian tubes during menstruation and implants on peritoneal surface or pelvic organs. This peritoneal reflux could be a necessary but not suf…