Contribution of PET (Positron Emission Tomography) Scans for the Preoperative Assessment of Symptomatic Endometriosis Lesions: TEP-ENDORUN

Inclusion Criteria: * Patient aged over 18 and under 50 * Patient with symptomatic endometriosis with indication for surgery * Showing at least one typical endometriosis lesion on MRI, greater than 5mm * Accepting surgical management * Having signed an informed consent after information * Affiliate or beneficiary of a social security scheme Exclusion Criteria: * Patient who has received an injection with GnRH (gonadotropin-releasing hormone ) analogues for less than 3 months (because it induces the quiescence of the disease which is no longer stimulated by estrogen secretion) * Patient with a history of heavy abdominopelvic surgery * Diabetic patient * Patient unable to understand the interest of the study * Patient already included in another therapeutic trial with an experimental molecule. * Persons referred to in articles L1121-5 to L1121-8 of the PHC (public health code) (corresponding to all protected persons: pregnant woman, parturient, nursing mother, person deprived of liberty by judicial or administrative decision, minor, and person making the subject to a legal protection measure: guardianship or curators) * Contraindications to PET Scanner (major claustrophobia, contraindication or hypersensitivity to 18-FDG or one of its excipients, contraindication or hypersensitivity to Ultravist® or one of its excipients, etc.) * Contraindication to surgery or anesthesia