Evaluation of the Efficacy of HIFU Treatment on Rectal Endometriosis Symptoms.

Inclusion Criteria: * Patient 18 years of age or older, * Rectal endometriosis on preoperative imaging with no other digestive location, * Symptomatic patient (Acute pelvic pain \> 3), in failure of drug treatment, * Endometriotic lesion visible on ultrasound and confirmed on MRI, * Centralized MRI, reviewed and validated by the MRI review committee, * No current pregnancy and no pregnancy plan during the study period, * Patient agreeing not to change her hormonal treatment throughout the study period, * Patient accepting the constraints of follow-up defined in the framework of the study, * Patient affiliated to French health insurance. Exclusion Criteria: * Ongoing urogenital infection, * Anorectal anatomy incompatible with HIFU treatment, * Overall pain level considered intolerable by the patient and making a potential 3-months delay management impossible, * History of segmental rectal resection or discoid resection, * Patient with an implant located less than 1 cm from the treatment area, * Inflammatory disease of the colon, * Allergy to latex, * No scheduled endometriosis procedures during study follow-up, * Treatment of endometriosis in the context of pregnancy desire for which a 3-month delay is not appropriate * Patient with contraindications to MRI, * Patient who has already received HIFU treatment for a rectal endometriotic lesion, * Patient who does not speak or read French, * Patient deprived of liberty following a judicial or administrative decision, * Patient in labor or nursing, * Patient under guardianship or curatorship