Inclusion Criteria:  Women aged between 18-40 years Clinically diagnosed endometriosis and awaiting surgery BMI 20-35 kg/m2 No past abdominal surgical history Participant willing and able to give informed consent for participation in the study  Exclusion Criteria:  Previous surgery in 12 months prior to consent:  abdominal surgery surgery for endometriosis The participant may not enter the study if they have any contraindication to magnetic resonance imaging (standard MR exclusion criteria including pregnancy, extensive tattoos, pacemaker, shrapnel injury, severe claustrophobia). Any other cause, including a significant disease or disorder which, in the opinion of the investigator, may either put the participant at risk because of participation in the study, or may influence the participant's ability to participate in the study.