Evaluation of High Intensity Focused Ultrasound (HIFU) in the Treatment of Rectal Endometriosis

Inclusion Criteria: * Patients aged at least 25 years-old * Rectal endometriosis in preoperative imaging, without other digestive locations (colon, ileum and small intentine) * Symptomatic patient refusing hormonal treatment and/or surgery. * Endometriosic nodule visible on echography with contrast and confirmed in Gadolinium MRI and difusion sequence (according to standardized protocol) * Nodule with intrarectal protrusion of less than 50% (allowing the positioning of the probe in front of the rectal nodule) * Distance from the upper pole to the anal margin ≤ 15 cm (measurement by MRI with intra-rectal contrast) * No curent pregnancy (negative BHCG \<72h before the HIFU procedure) and no pregnancy project within 6 months after the HIFU procedure (post-treatment MRI delay) * Patient agreeing not to change her hormone treatment for the duration of the study. * Patient accepting the study constraints * Health insurance affiliated patient or beneficiary of an equivalent coverage Exclusion Criteria: * Virgin patient * Ongoing uro-genital infection * Anorectal anatomy incompatible with HIFU therapy * History of segmental rectal resection with mechanical anastomosis, shaving or discoid resection * Patient with an implant within 1cm of the treatment area (stent, catheter, ESSURE® contraceptive implants). * Inflammatory colon disease (ulcerative colitis, Crohn's disease and others) * Latex allergy * Patient with contraindications to MRI * Patient with contraindications to Gadolinium injection * Patient previously treated with HIFU for a rectal endometriotic lesion * Patient not speaking nor reading French * Patient deprived of liberty following a legal or administrative decision * Patient under guardianship or tutelage measure