Introduction

Advancements in minimally invasive gynecological surgery have significantly improved patient safety, surgical precision, and postoperative recovery. Among these innovations, the integration of Indocyanine Green (ICG) fluorescence imaging during Total Laparoscopic Hysterectomy (TLH) with Bilateral Salpingectomy has emerged as a groundbreaking technique for real-time ureter identification. This modern approach enhances visualization of critical pelvic anatomy, reduces the risk of ureteric injury, and elevates the overall safety profile of complex laparoscopic procedures.

ICG-guided fluorescence technology represents the next generation of image-guided surgery, allowing surgeons to visualize hidden structures intraoperatively with remarkable clarity. In gynecologic surgery, where ureteric injuries remain one of the most feared complications, real-time fluorescence navigation provides an additional layer of surgical confidence and precision.

Understanding Total Laparoscopic Hysterectomy with Bilateral Salpingectomy

Total Laparoscopic Hysterectomy (TLH) involves the complete removal of the uterus and cervix using minimally invasive laparoscopic techniques. Bilateral Salpingectomy refers to the simultaneous removal of both fallopian tubes, which is increasingly recommended to reduce the future risk of ovarian cancer.

This combined procedure is commonly indicated for:

• Symptomatic uterine fibroids
• Abnormal uterine bleeding
• Adenomyosis
• Endometriosis
• Chronic pelvic pain
• Premalignant gynecological conditions
• Risk-reducing gynecologic surgery

Despite being a routine minimally invasive operation, pelvic surgery carries inherent risks due to the close anatomical relationship between the uterus, bladder, bowel, and ureters.

The Importance of Ureter Identification in Gynecologic Surgery

The ureters are delicate tubular structures responsible for transporting urine from the kidneys to the bladder. During hysterectomy, especially in patients with distorted pelvic anatomy, severe adhesions, endometriosis, large fibroids, or previous surgeries, the ureters can become difficult to identify.

Unrecognized ureteric injury may result in:

• Urinary fistula formation
• Ureteric obstruction
• Kidney damage
• Infection and sepsis
• Need for reconstructive surgery
• Increased medicolegal complications

Traditional laparoscopic surgery relies heavily on anatomical landmarks and surgeon experience. However, fluorescence-guided surgery introduces real-time visual enhancement that dramatically improves intraoperative orientation.

What is ICG Fluorescence Imaging?

Indocyanine Green (ICG) is a fluorescent dye that emits near-infrared light when illuminated with specialized laparoscopic imaging systems. After administration, the dye allows surgeons to visualize blood flow, lymphatic channels, and anatomical structures invisible under standard white-light laparoscopy.

In ureter identification techniques, ICG can be used through:

• Intravenous injection
• Ureteral catheter-guided instillation
• Fluorescent ureteral stenting methods

The near-infrared camera system captures fluorescence signals in real time, enabling surgeons to trace the exact course of the ureters throughout the operation.

Surgical Technique: ICG-Guided Real-Time Ureter Visualization

1. Patient Preparation

The patient is positioned in dorsal lithotomy under general anesthesia. Standard laparoscopic port placement is performed after pneumoperitoneum creation.

Preoperative evaluation includes:

• Pelvic imaging
• Assessment of previous surgeries
• Renal function evaluation
• Allergy screening for ICG or iodine sensitivity

2. Ureteral Fluorescence Setup

Depending on the surgical protocol, ICG is administered either intravenously or directly into ureteral catheters placed cystoscopically. The fluorescence imaging system is then activated.

Under near-infrared mode, the ureters appear as glowing fluorescent structures, clearly distinguishable from surrounding tissues.

3. Pelvic Dissection

The surgeon proceeds with:

• Round ligament division
• Broad ligament dissection
• Bladder flap creation
• Uterine vessel sealing
• Colpotomy and specimen removal

Throughout the procedure, continuous fluorescence guidance helps maintain a safe distance from the ureters during energy application and tissue dissection.

4. Bilateral Salpingectomy

Both fallopian tubes are carefully dissected and removed while preserving ovarian vascular supply when indicated.

The enhanced visualization ensures accurate identification of adjacent structures, reducing accidental thermal injury.

5. Final Inspection

Before closure, the surgeon reassesses ureteral integrity using fluorescence imaging to confirm uninterrupted ureteral course and perfusion.

This final safety check significantly improves intraoperative confidence and postoperative outcomes.

Advantages of ICG-Guided Ureter Identification

Enhanced Surgical Safety

Real-time fluorescence dramatically lowers the possibility of ureteric injury during difficult dissections.

Superior Anatomical Visualization

Even in distorted anatomy, ICG fluorescence clearly outlines the ureteral pathway.

Reduced Operative Stress

Surgeons gain additional visual reassurance during complex pelvic procedures.

Improved Precision

Precise dissection minimizes collateral thermal damage to surrounding tissues.

Better Outcomes in Complex Cases

Particularly beneficial for:

• Severe endometriosis
• Large cervical fibroids
• Adhesive disease
• Obesity
• Reoperative pelvic surgery

Faster Recognition of Complications

Immediate detection of ureteral compromise allows prompt correction intraoperatively.

Clinical Applications Beyond Hysterectomy

ICG fluorescence imaging is increasingly utilized in various surgical specialties including:

• Oncologic gynecologic surgery
• Endometriosis excision
• Colorectal surgery
• Urologic procedures
• Robotic pelvic surgery
• Sentinel lymph node mapping

Its expanding role highlights the future of precision-guided minimally invasive surgery.

Challenges and Limitations

Although highly promising, ICG-guided surgery has certain limitations:

• Requirement for specialized fluorescence imaging equipment
• Additional procedural cost
• Learning curve for interpretation of fluorescence images
• Rare allergic reactions to ICG dye
• Limited availability in smaller surgical centers

Nevertheless, the growing adoption of fluorescence-guided surgery continues to improve accessibility and affordability.

Future Perspectives in Fluorescence-Guided Surgery

The future of gynecologic surgery is rapidly evolving toward augmented visualization technologies. Emerging innovations include:

• Artificial intelligence-assisted fluorescence interpretation
• Robotic-integrated fluorescence platforms
• Enhanced tissue perfusion mapping
• Real-time nerve preservation imaging
• Precision oncologic navigation systems

ICG-guided ureter identification is likely to become a standard safety protocol in advanced laparoscopic hysterectomy.

Conclusion

ICG-Guided Total Laparoscopic Hysterectomy with Bilateral Salpingectomy represents a transformative advancement in minimally invasive gynecologic surgery. The ability to visualize ureters in real time using fluorescence imaging significantly enhances surgical safety, precision, and confidence during complex pelvic dissections.

As minimally invasive surgery continues to evolve, fluorescence-guided navigation is redefining surgical standards and helping surgeons achieve safer outcomes with fewer complications. This innovative technique marks a major step forward in the pursuit of precision surgery and patient-centered care in gynecology.