Doctors at the All India Institute of Medical Sciences (AIIMS), New Delhi, have identified two high-risk anatomical zones that could help surgeons reduce bleeding and avoid injuries to vital organs during complex cancer operations. These anatomical landmarks highlight areas where surgeons must exercise particular caution to protect critical blood vessels, nerves and surrounding organs. The two concepts, known as “Ray’s Zone” in the pelvis and “Ray’s Hepatocaval Triangle” near the liver, aim to support safer, more precise surgery through improved anatomical understanding and careful dissection.
Ray’s Zone Highlights Critical Risks During Pelvic Cancer Surgery
Dr M D Ray, Professor in the Department of Surgical Oncology at Dr BRA-IRCH, AIIMS Delhi, and his team identified an area below the uterine vessels as the “Red Alert Zone” or “Ray’s Zone.” This region contains the ureter, urinary bladder, pelvic nerves and important blood vessels in close proximity, making surgical dissection particularly challenging. The concept emerged from a study involving 255 radical or modified radical hysterectomies performed to treat cervical, endometrial and ovarian cancers. After examining the anatomy and analysing the causes of bleeding and operative injuries, the team modified its surgical approach in the later 105 cases. The revised technique emphasised careful anatomical visualisation, magnification when necessary, individual vessel ligation and limited use of cautery near the pelvic ureter.
Anatomy-Guided Techniques Aim to Reduce Surgical Complications
According to the researchers, careful dissection within Ray’s Zone could help surgeons reduce blood loss and minimise injuries to the ureter, bladder and pelvic nerves. These measures are important because injuries to these structures can affect urinary function, nerve function and postoperative recovery. Therefore, identifying the high-risk region before dissection begins may help surgeons plan their approach more effectively and preserve surrounding tissues. The technique reinforces the importance of understanding anatomical relationships and controlling each surgical step, particularly during complex gynaecological cancer procedures.
Ray’s Hepatocaval Triangle Focuses on Liver Surgery Risks
Dr Ray has also described another surgically significant region called “Ray’s Hepatocaval Triangle,” which is relevant during liver mobilisation and dissection near the inferior vena cava and major hepatic veins. This region presents substantial technical challenges because uncontrolled manipulation can injure major blood vessels and cause severe bleeding. Consequently, a clearly defined anatomical reference may help surgeons orient themselves and exercise greater precision when operating close to these critical vascular structures. By recognising this high-risk area before proceeding with dissection, surgeons may be better positioned to plan their movements and minimise the risk of major vascular injury.
Two Anatomical Landmarks Share One Safety Principle
Although Ray’s Zone and Ray’s Hepatocaval Triangle relate to different anatomical regions, both concepts follow the same principle: identify potentially hazardous areas before dissection and proceed with controlled, anatomy-guided surgical techniques. As reported by ndtv.com, the researchers suggest that this approach to anatomical mapping could support surgical precision and help preserve vital structures during major oncological procedures. In practical terms, Ray’s Zone serves as an anatomical warning area during pelvic cancer surgery, while Ray’s Hepatocaval Triangle provides a reference point for procedures near the liver’s major blood vessels. Together, these concepts highlight how detailed anatomical knowledge can contribute to safer surgical planning and improved patient care.