PI decided to terminate the trial

Deep infiltrating endometriosis (DIE) is a severe form of endometriosis in which lesions affect retroperitoneal tissue and pelvic organs wall. It is often characterized by pain (dysmenorrhea, dysuria, dyspnea, dyspareunia, and chronic pelvic pain) and infertility, drastically impacting on women' quality of life. It is typically multifocal, involving uterosacral ligaments, the upper third of posterior vaginal wall, bowel, bladder, and ureters.

Indocyanine green (ICG) is an anionic tricarbocyanine molecule able to bind to plasma proteins into the vascular system and to become fluorescent if excited by near-infrared light (NIR). NIR-ICG imaging is used in gynecology for the intraoperative diagnosis of occult peritoneal and deep endometriosis at white light and to assess tissue perfusion and guide surgical strategy.

Patients with clinical and trans-vaginal / abdominal ultrasound diagnosis of deep endometriosis, undergoing surgery for the removal of endometriotic lesions are included in the study.

Ureter perfusion will be intraoperatively assessed using indocyanine green angiography.

After surgery, patients will be included in the post-operative follow-up, as usual in our clinical practice.

Inclusion Criteria:

• patients undergoing laparoscopic surgery for endometriosis
• informed consent to participate in the study

Exclusion Criteria:

• known or suspected allergy to iodide
• history of active pelvic infection
• presence of intra-abdominal or pelvic malignancy
• pelvic radiation therapy
• hyperthyroidism
• liver dysfunction
• serum creatinine > 2.0 mg/dL