Augmented reality in gynecologic laparoscopic surgery: development, evaluation of accuracy and clinical relevance of a device useful to identify ureters during surgery.

OBJECTIVE: To develop and evaluate a non-invasive surgical assistance based on augmented reality (AR) in the detection of ureters on animal model. METHOD: After an experimental prototyping step on two pigs to determine the optimal conditions for visualization of the ureter in AR, three pigs were operated three times at 1 week intervals. The intervention consisted of an identification of the ureter, with and without the assistance of AR. At the end of the intervention, a clip was placed on the AR-proposed ureter to evaluate its accuracy. By doing a cone beam computed tomography, we measured the distance between the contrasted ureter and the clips in the acquired volume. Thirteen videos were recorded, allowing subsequent evaluation of the clinical relevance of the device. RESULTS: The feasibility of the technique has been confirmed. The margin of error was 1.77 mm (± 1.56 mm) for ureter localization accuracy. In order to evaluate the perceived relevance and accuracy in the detection of AR-assisted ureter, 58 gynecological surgeons were shown the videos then questioned. Of the 754 responses obtained (13 videos × 58 surgeons), the ureter was identified in direct vision in 31.2% of cases versus 81.7% in AR (p value 3.62 × 10-7). When looking at pigs that had already had one or two operations, the ureter was identified in only 16% of cases with direct vision compared to 76.1% with AR (p-value 5.48 × 10-19). In addition, 67% of surgeons felt that AR allowed them to better identify the ureters and 61% that AR reconstruction was accurate. CONCLUSION: This first AR device showed a satisfactory precision in the detection of ureters with a favorable opinion of surgeons. This surgical assistance system could be helpful in the performance of difficult procedures, for example in the case of patients, which have undergone multiple surgeries in the past.

Laparoscopic Transperitoneal Para-Aortic Lymphadenectomy in 10 Steps.

STUDY OBJECTIVE: Laparoscopic transperitoneal lymphadenectomy has a few advantages. First, it is a minimally invasive approach, and the transperitoneal approach is also the best option when intra-abdominal surgery is indicated. Although the procedure was described more than 2 decades ago, there is a lack of diffusion of the technique. The main objective of this video is standardization and a simple description of the technique. We described this procedure in 10 logical steps, which should help to understand and perform this procedure. METHODS: This video presents a systematic approach to transperitoneal lumboaortic lymphadenectomy, which is clearly divided in 10 steps ordered in a counterclockwise direction. RESULTS: The 10 steps are as follows: step 1, retroperitoneal access; step 2, creating a space for subsequent lymphadenectomy and identification of anatomic landmarks; step 3, left common iliac lymph node dissection; step 4, right common iliac lymph node dissection; step 5, presacral lymph node dissection; step 6, lateroaortal lymph node dissection; step 7, laterocaval lymph node dissection; step 8, aortocaval lymph node dissection; step 9, vaginal extraction of bags with specimens; and step 10, vaginal suture. CONCLUSIONS: Laparoscopic transperitoneal access to lumboaortic lymph nodes is an effective method of lymphadenectomy, which may bring benefits to a patient and physician. The presented 10 steps help to perform each part of surgery in a logical sequence, making the procedure ergonomic and easier to adopt and learn. Standardization of laparoscopic techniques could help to reduce the learning curve.

Type B Laparoscopic Radical Trachelectomy With Pelvic Lymphadenectomy for Early Cervical Cancer.

STUDY OBJECTIVE: To demonstrate the technique of laparoscopic radical trachelectomy (LRT) and laparoscopic pelvic lymphadenectomy for early cervical cancer. DESIGN: Case report (Canadian Task Force Classification Study design III). SETTING: Tertiary referral centre in Strasbourg, France. BACKGROUND: Over the past 15 years, gynecologic oncologists have sought ways to preserve female fertility when treating invasive cervical cancer. Many cases of cervical cancer have been diagnosed in young women with a desire to preserve their fertility. As more women are delaying childbearing, fertility preservation has become an important consideration. Radical hysterectomy and bilateral pelvic lymphadenectomy represent the standard surgical treatment for stage IA2-IB1 cervical cancer. In some women with small localized invasive cervical cancer, there is hope for a pregnancy after treatment. Vaginal radical trachelectomy (VRT) is a fertilitypreserving surgical procedure for early-stage cervical cancers. The National Comprehensive Cancer Network has published guidelines stating that radical trachelectomy is part of the standard of care for women desiring to preserve their future fertility. VRTwas introduced in 1987 with its first reported use in 1994, and since then more than 1000 cases of VRT have been reported involving more than 250 live births. The tumor recurrence rate is between 4.2% and 5.3%, and the mortality rate is between 2.5% and 3.2%. However, VRT has several limitations despite results demonstrating the safety of the procedure. One limitation is that it is an inadequate procedure for nulliparous patients and those with history of previous conization with adverse vaginal anatomy. In addition, it is difficult to learn the techniques involved in radical vaginal surgery. PATIENTS: A 26 year-old nulliparous women with a FIGO Stage IB1 squamous cell tumor of the cervix. A first conisation was performed with no safe resection margins. INTERVENTION: In this video we show a type B laparoscopic radical trachelectomy with round ligament and uterine artery preservation. A laparoscopic pelvic lymphadenectomy was also performed. Our institutional review board approved this study. MEASUREMENTS AND MAIN RESULTS: Operative time was 240 minutes. Intraoperative blood loss was less than 100 mL. The operation was performed successfully with no intraoperative complications. Pathological findings demonstrated the presence of a cervical intraepithelial neoplasia 2 on the anterior lips from an 11 o'clock to a 1 o'clock position. Resection margins were safe. The surgical specimen did not show any residual invasive carcinoma. Twenty one lymph nodes were removed, 7 on the right side, and 14 on the left side. No metastatic adenopathy was found. The patient was discharged on day 11. After 5 months, no late complications or recurrence was detected. CONCLUSIONS: LRT appears to be a safe option for women who intend to maintain their desire for a future pregnancy.