Risk of lymph node metastasis in colorectal T1 (SM) carcinoma
Abstract:
In this report, we reviewed risk factors for lymph node metastasis in colorectal T1 (SM) carcinoma in relation to the chronological trend of the management of T1 colorectal carci- noma after endoscopic treatment. Recently according to the accumulation of many cases and detailed pathologic evaluation, after complete endoscopic en bloc resection, if below all conditions are satisfied in histological examination, 1) submucosal invasion depth: less than 1,000 pm, 2)histologic grade: favorable, 3)no vessel involvement and 4)budding grade: low, it shows very low risk of lymph node metastasis. Also, in this report, we assess the conditions for additional surgery after endoscopic resection based on the risk stratification of lymph node metastasis.
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