P15.06: Ileocaecal endometriosis: a role for magnetic resonance enterography to improve routine screening? A preliminary study

To prospectively assess the accuracy of magnetic resonance (MR) enterography in preoperative screening of deep infiltrating endometriosis (DIE) for the diagnosis of right DIE lesions located in the ileocaecal junction and recto sigmoid junction. Between 2012 and 2015, 100 MR enterographies, were performed for patients recruited because of pelvic DIE suspicion. Analysis of bowel involvement was prospectively achieved, regarding the caecum, ileum, and furthermore the sigmoid and rectum. Surgical and pathological findings were compared to MR enterographies results. Among the 100 patients with MRenterography, 20 underwent complete surgery including pathological examination and were included in the final analyses. Sixteen (80%) patients had bowel DIE involvement at surgical examination. 35 bowel lesions were histopathologically analysed: 5 ileal, 4 caecal, 10 sigmoid and 16 rectal. Accuracy of MRenterography was: Se/Spe: 100% / 87,5%, Se/Spe: 100% / 88,8%, Se/Spe: 100% / 100%, and Se/Spe 100%/: 100% for caecal, ileal, rectal and sigmoid lesions respectively. These preliminary results highlight that MR enterography could be accurate for the routine preoperative screening of bowel lesions and DIE, especially for diagnosing ileocaecal involvement, which is currently widely underestimated with classical pelvic MRI.