Laparoscopic ovarian cystectomy is the technique of choice in patients with large ovarian endometriomas. However, post operative residual ovarian function remains a major concern. Objectives: The aim of this prospective, randomized study was to compare two different techniques of stripping at the original adhesion site and at the hilus. We also aimed to determine which technique of ovarian cystectomy is tissue sparing, by histopathology analysis and by determining the residual ovarian volume. Materials and methods: 32 patients were enrolled, who had laparoscopically confirmed endometriomas > 3 cm in diameter.