Comparison of Inferior and Medial Approaches in Laparoscopic and Robotic CME for Right Colon Cancer

Overview

This multicenter propensity score-matched study compared the inferior approach (IA) and medial approach (MA) in laparoscopic and robotic complete mesocolic excision (CME) for right-sided colon cancer. Results demonstrated comparable perioperative safety and efficacy between IA and MA, with no significant differences in operative time, blood loss, or complication rates.

Background

Complete mesocolic excision (CME) with central vascular ligation (CVL) has become the standard surgical treatment for right-sided colon cancer due to improved long-term outcomes. However, right hemicolectomy remains complex because of anatomical vascular variations, resulting in a perioperative complication rate of 6.4–8.0%. Various surgical approaches, including the medial approach (MA) and inferior approach (IA), differ in the sequence and technique of bowel mobilization and dissection. Despite their widespread use, comparative data on these approaches in a multicenter setting are limited.

Data Highlights

Key Findings

• Both IA and MA achieved comparable operative times and blood loss in laparoscopic and robotic CME for right-sided colon cancer.
• No significant difference was observed in overall perioperative complication rates between the two approaches.
• The number of harvested lymph nodes, an important oncologic metric, was similar between IA and MA.
• Conversion rates to open surgery were low and did not differ significantly between groups.
• Surgeon experience varied widely, but outcomes remained consistent across approaches after propensity score matching.

Clinical Implications

Surgeons can select either the inferior or medial approach for laparoscopic or robotic CME in right-sided colon cancer without compromising perioperative safety or oncologic adequacy. Familiarity with both techniques may allow tailoring of the surgical approach to patient anatomy and institutional preference. Continued emphasis on surgeon training and experience is important to maintain low complication rates.

Conclusion

This propensity score-matched multicenter study demonstrates that both inferior and medial surgical approaches provide safe and effective options for CME in right-sided colon cancer, supporting their use as standard techniques in clinical practice.

References

1. Hohenberger et al. -- Complete Mesocolic Excision and Central Vascular Ligation
2. RELARC Trial -- CME Impact on Colorectal Cancer Outcomes
3. COLD Trial -- CME and CVL in Colon Cancer Surgery
4. Japanese Guidelines -- Surgical Standards for Colon Cancer
5. Japanese Gastrointestinal Surgery Database -- Perioperative Mortality Rates
6. Anatomical Variations in Right Colon Surgery
7. Surgical Complexity in Right Hemicolectomy
8. Medial Approach Technique Reports
9. Inferior Approach Technique Reports
10. Propensity Score Matching in Surgical Studies