The extent of D3 lymphadenectomy for right colon cancer, especially the medial border of central lymph node dissection remains controversial. D3 lymphadenectomy and complete mesocolon excision (CME) are two standard procedures for locally advanced right colon carcinoma. D3 lymphadenectomy determines the medial border according to the distribution of the lymph nodes. The mainstream medial border should be the left side of superior mesenteric vein (SMV) according to the definition of D3, but there are also some reports that regards the left side of superior mesenteric artery (SMA) as the medial border. In contrast, the CME procedure emphasizes the beginning of the colonic mesentery and the left side of SMA should be considered as the medial border. Combined with the anatomical basis, oncological efficacy and technical feasibility of D3 lymph node dissection, we think that it is safe and feasible to take the left side of SMA as the medial boundary of D3 lymph node dissection. This procedure not only takes into account the integrity of mesangial and regional lymph node dissection, but also dissects more distant lymph nodes at risk of metastasis. It has its anatomical basis and potential oncological advantages. However, at present, this technical concept is still in the exploratory stage in practice, and the related clinical evidence is not sufficient.
目前对右半结肠癌D(3)淋巴结清扫的范围，特别是中央淋巴结清扫的内侧界尚存争议。D(3)淋巴结清扫和完整结肠系膜切除术（CME）是局部进展期右半结肠癌手术的两种主流术式。D(3)是从淋巴结的分布角度描述内侧界，主流清扫内侧界应该是肠系膜上静脉（SMV）左侧，但也有肠系膜上动脉（SMA）左侧作为内侧界的报道；而CME是从结肠系膜起点的角度来描述内侧界，应该强调SMA左侧。本文结合D(3)清扫内侧界的解剖学基础、肿瘤学疗效以及技术可行性等方面，综合认为，以SMA左侧为D(3)淋巴结清扫的内侧界是安全可行的。这一方式同时兼顾了系膜和区域淋巴结清扫的完整性，且清扫了更多存在转移风险的远处淋巴结，有其解剖学依据和潜在的肿瘤学优势。但就目前而言，这一技术理念在实践上仍属探索阶段，相关临床证据尚未充分。.
Keywords: Colon neoplasms, right; Complete mesocolon excision; D(3) lymphadenectomy.