title: TisN0M1 Sigmoid Colon Cancer: A Case Report.
abstract: Distant metastasis of a colon carcinoma in situ has not yet been reported. We experienced a case of a sigmoid colon carcinoma in situ with common hepatic lymph node metastasis. After the first operation, we diagnosed dual intramucosal adenocarcinomas of the sigmoid colon without any regional lymph node metastasis. After the second operation, a metastatic adenocarcinoma was found in the common hepatic lymph nodes. We suggest that metastasis in cases of a colonic carcinoma in situ is rare, but possible. The parallel progression model of tumors can explain this early metastasis.
authors.affiliation: Department of Surgery, Chungnam National University Hospital, Daejoen, Korea.
authors.forename: Kyung Ha
authors.initials: KH
authors.lastname: Lee
authors.affiliation: Department of Surgery, Chungnam National University Hospital, Daejoen, Korea.
authors.forename: Jin Su
authors.initials: JS
authors.lastname: Kim
authors.affiliation: Department of Surgery, Chungnam National University Hospital, Daejoen, Korea.
authors.forename: Kwang Sik
authors.initials: KS
authors.lastname: Cheon
authors.affiliation: Department of Surgery, Chungnam National University Hospital, Daejoen, Korea.
authors.forename: In Sang
authors.initials: IS
authors.lastname: Song
authors.affiliation: Department of Pathology, Chungnam National University Hospital, Daejoen, Korea.
authors.forename: Dae Young
authors.initials: DY
authors.lastname: Kang
authors.affiliation: Department of Surgery, Chungnam National University Hospital, Daejoen, Korea.
authors.forename: Ji Yeon
authors.initials: JY
authors.lastname: Kim
keywords: Adenocarcinoma; Carcinoma in situ; Colon neoplasms; Lymphatic metastasis