This course strengthens transvaginal ultrasound skills for diagnosing and preoperatively assessing endometriosis using the IDEA consensus. A standardized, stepwise approach improves detection and reproducibility, highlighting key markers like the sliding sign and pouch of Douglas obliteration. Detailed evaluation of the rectosigmoid, uterosacral ligaments, bladder, and ureters is covered, and findings are linked to surgical complexity, multidisciplinary planning, and patient counselling.