Local MRI Protocol:
All pelvic MRIs were carried out with either a 1.5T or 3T MRI system (Philips, Ingenia, the Netherlands). Local protocol included a T2-weighted turbo spin echo (T2-TSE) sequence in the sagittal, axial, and coronal planes, and a T1-weighted turbo spin echo (T1-TSE) sequence in the axial plane. A slice thickness of 3 millimetres was generally used, with variations ranging from 3-5 millimetres. All patients were pre-treated with an antispasmodic agent (1 mL of 20 mg/mL Buscopanī›š, Sanofi, Paris, France) intravenously or intramuscularly to minimise the effects of uterine and bowel peristalsis on image interpretation. Some patients received multiple pelvic MRIs prior to hysterectomy. In those cases, the MRI closest to the hysterectomy was chosen for the assessment. See supplementary file B for full details.