背景和目的多年来,结直肠癌结外肿瘤种植(tumor deposits,TDs)一直备受争议。TDs定义为位于的结肠或直肠周围脂肪中,与原发肿瘤和淋巴结无关联的孤立腺癌结节。第七版TNM分期系统对其提出了pN1c的概念。修改后分期变化显著,例如淋巴结转移阴性但TDs阳性的T1-2患者,将从原分期中Ⅰ期变为Ⅲa期。新分期并未区分同时具有淋巴结转移阳 Background and Objective Over the years, tumor deposits (TDs) have been the subject of controversy. TDs are defined as isolated adenocarcinoma nodules that are not associated with primary tumors and lymph nodes located in the perianal or rectal fat. The seventh edition of the TNM staging system put forward the concept of pN1c. The modified staging changes significantly, such as negative lymph node metastases but TDs positive T1-2 patients, will change from the original phase Ⅰ to Ⅲ a stage. The new staging does not distinguish between lymph node metastasis yang