Quality control will be maintained by standardizing the protocols across the centers. As stated above, in each patient, the locations of all lesions suspected to be endometriosis detected with each modality will be documented with photographs. All discordant lesions (seen under only one imaging modality) and a random 10% sample of the images and specimen samples from each center will be re-reviewed by a central independent reviewer at the coordinating center. The results between the site physician and the central reviewer will be compared. If the site and central reviewer have disagreement on the photographed lesion or pathology, adjudication will be performed between the site and the central reviewer. If a consensus still cannot be reached, a third party (surgeon and/or pathologist (from the remaining site) will be used as the tie breaker.