Evaluation of Endometriosis With 18F-fluorofuranylnorprogesterone PET / MRI

Inclusion Criteria * Age 18 or older * Female of childbearing age (18-55 years) * Clinically suspected (symptomatic) endometriosis as defined by referring physician (this would also include endometriomas as other disease may be present). * Scheduled for planned operative laparoscopy with no hormone treatment for at least two cycles * Able to provide informed consent Exclusion Criteria * Male * Institutionalized subject (prisoner or nursing home patient) * Known history of breast, ovarian or endometrial cancer. * Pregnant or breast-feeding women * Chronic progestin-containing medications or Gonadotropin-releasing hormone (GnRH) analogues in the last 10-16 days (or 2 cycles in the case of GnRH analogues as these are dosed monthly) or inability to discontinue these medications * Allergy to gadolinium contrast or Glomerular Filtration Rate (GFR) below 30 ml/min.