To study the use of intraoperative transvaginal ultrasound after bowel endometriosis shaving.Stepwise demonstration with a narrated video footage of preoperative and intraoperative ultrasound to evaluate the extent of an endometriotic rectal nodule.Lausanne University Hospital and Geneva University Hospital.Two women with symptomatic endometriosis rectal lesion.Preoperative transvaginal ultrasound was performed to measure the rectal nodule. After completing bowel shaving, the surgeon conducted both clinical and sonographic evaluations of the rectal wall. Clinically, this was performed using laparoscopic grasping forceps and sonographically with a transvaginal probe after filling the pelvis with saline solution.Assessment of the rectal wall for residual disease after bowel shaving and evaluation of the necessity for additional bowel resection.After sonographic evaluation of the rectal wall, the surgeon decided in both patients to perform a discoid resection because of the presence of a residual rectal disease despite thorough bowel shaving.Intraoperative transvaginal ultrasound after bowel endometriosis shaving is a promising technique that is safe, reproducible, and efficient. It aids surgeons in accurately assessing the extent of excision of deep rectosigmoid infiltrating endometriosis and determining the necessity of additional bowel resection to reduce recurrence risk. Moreover, intraoperative ultrasound provides precise measurements of residual nodules, enabling differentiation between persistent, recurrent, or new lesions during follow-up.