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,
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.