Study on the Ultrasound and Biological Characteristics of Atypical Endometriosis. (ENDOAT)

Observational, retrospective-prospective, cross-sectional, single-center study conducted on patients undergoing laparoscopic surgery for benign or malignant pathology (endometrial or ovarian). The study does not include changes to the standard care pathway and all procedures are in normal clinical practice. The indication for surgical treatment is formulated on the basis of the most up-to-date guidelines on the subject. The study includes two phases:

• Single-center observational retrospective study with case collection starting June 2024
• Single-center prospective observational study with recruitment of new cases for 30 months after the start of the project.

At the time of the pre-hospitalization visit, the patient will be clearly and understandably illustrated with the rationale and objective of the study, the planned procedures (which do not deviate from normal clinical practice) and the data that are intended to be collected for each patient. There are four groups under comparison: patients with endometriosis without atypia and patients with neoplasia not associated with endometriosis represent the "controls", while patients with atypical endometriosis and patients with cancerized endometriosis or neoplasia associated with endometriosis represent the "cases". Patients with ovarian / endometrial neoplasia not associated with endometriosis will serve as a control for both the ultrasound appearance of the lesions and for anatomopathological analysis (including immunohistochemical and molecular investigations).

Patients included in the study will undergo a level II gynecological ultrasound with transvaginal technique by experienced operators, the images will be reviewed by two experienced operators.

Patients will be operated on by operators experienced in endometriosis surgery. The anatomopathological diagnostic report will be structured sec. International Collaboration on Cancer Reporting (ICCR) (Annexes 1 and 2), which includes essential elements ("core"), and optional elements ("non-core") (https://www.iccr-cancer.org/).

Each case will be evaluated individually and then in doubles by two anatomopathologists experienced in gynecological pathology.

The immunohistochemical and molecular panel are routinely performed in patients with atypical endometriosis, cancerized endometriosis, or endometriosis-associated neoplasia and in neoplasms not associated with endometriosis, therefore the performance of these procedures does not deviate from such clinical practice. In patients with endometriosis "typical", a reduced panel will be performed, if deemed necessary by the pathologist, particularly if there are dubious morphological pictures.