Treatment of Is Type Early Colorectal Carcinoma with sm Invasion Keiichi Takahashi 1 1Department of Surgery, Tokyo Metropolitan Komagome General Hospital Keyword: Is型大腸癌 , 大腸sm癌 , 追加腸切除 , リンパ節転移 , sm浸潤度分類 pp.1503-1510
Published Date 1997/10/25
DOI https://doi.org/10.11477/mf.1403105228
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 We resected 208 cases of early colorectal carcinoma with sm invasion in our hospital. Ninety-nine cases were Is type, 83 cases were surgically resected initially, and 13 cases (13.3%) were endoscopically treated, then followed by surgical resection. We classified carcinoma with sm invasion into three sub-groups by the depth of invasion: sm1 was the group of lesions with superficial invasion of the submucosal layer, sm3 was the group of lesions with deep invasion of the submucosal layer and sometimes invasion contacts with the proper muscle layer, and sm2 was the intermediate invasion between sm1 and sm3. In the sm1 group, we had no cases of lymph nodes metastasis, therefore local excision was enough to treat sm1 group. The incidences of lymph node metastasis in sm2 and sm3 group were 12.8 and 14.3% respectively. Those results suggested that colectomy with lymph node removal would be recommended for the cases of preoperative diagnosis of sm2 or sm3.

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