OC15.02: *Deep endometriosis assessment on ultrasound and MRI as defined by international deep endometriosis analysis (IDEA) group (diagnostic accuracy study)

First up to date study comparing diagnostic accuracy of ultrasound (US) and magnetic resonance (MR) using standardised IDEA group nomenclature. All patients planned for surgery for deep infiltrating endometriosis (DIE) were enrolled in the study conducted by Endometriosis Centre and Gynecologic Oncology Centre in Prague. Participants underwent preoperative staging with index tests (plane US and MR) following uniformly the IDEA group evaluation form, focusing on lesions in bladder, bowel, rectovaginal septum (RVS) and uterosacral ligaments (USLs). Sonographers and radiologists were blinded to the physical examination findings and other imaging results. Intraoperative and histopathological findings were used as a reference standard, following the same IDEA protocol. The bivariate analysis was used to compare both imaging modalities with laparoscopy. From 07/2016 to 2/2018, data of 49 patients were analysed, 2 were excluded due to lack of reference standard. Results are presented in table 1. This is the first study up to date comparing US and MR in the assessment of deep infiltrating endometriosis following the IDEA group nomenclature. Both methods showed similarly high sensitivity and specificity, with US being better in bladder and RVS DIE detection and MR being better in USLs assessment. The assessment of DIE in USLs represented the most critical task for both modalities.