title: Adenocarcinoma arising from jejunal ectopic pancreas mimicking peritoneal metastasis from colon cancer: a case report and literature review.
abstract: Adenocarcinoma arising from jejunal ectopic pancreas is very rare. We report a case of a 69-year-old female with adenocarcinoma arising from jejunal ectopic pancreas after resection of advanced colon cancer. She underwent right hemicolectomy for advanced ascending colon cancer (ypT3N0M0, stage IIA) after chemotherapy. Two and half years after colectomy, her tumor markers were elevated, and computed tomography revealed a mass measuring 20 × 20 mm in the small intestine, having an abnormal uptake of (18)F-fluorodeoxyglucose on (18)F-fluorodeoxyglucose-positron emission tomography ((18)FDG-PET). Double-balloon enteroscopy revealed a submucosal tumor in the jejunum, and histopathology of biopsy specimens from that lesion showed ectopic pancreas without malignancy. Therefore, peritoneal metastasis from colon cancer concomitant with ectopic pancreas or adenocarcinoma arising from ectopic pancreas was considered as a differential diagnosis. She underwent laparoscopic jejunectomy. Pathological examination revealed a moderately differentiated adenocarcinoma arising from jejunal ectopic pancreas, not peritoneal metastasis from colon cancer. Even if histopathology of the biopsy specimen shows ectopic pancreas without malignancy, adenocarcinoma arising from ectopic pancreas should be considered when the tumor markers are elevated or the lesion has an abnormal uptake of (18)FDG.
authors.affiliation: Division of Colon and Rectal Surgery, Shizuoka Cancer Center Hospital, 1007 Shimonagakubo, Nagaizumi-cho, Sunto-gun, Shizuoka, 411-8777, Japan. y.yamaoka@scchr.jp.
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Yamaoka
authors.affiliation: Division of Colon and Rectal Surgery, Shizuoka Cancer Center Hospital, 1007 Shimonagakubo, Nagaizumi-cho, Sunto-gun, Shizuoka, 411-8777, Japan. t.yamaguchi@scchr.jp.
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Yamaguchi
authors.affiliation: Division of Colon and Rectal Surgery, Shizuoka Cancer Center Hospital, 1007 Shimonagakubo, Nagaizumi-cho, Sunto-gun, Shizuoka, 411-8777, Japan. y.kinugasa@scchr.jp.
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Kinugasa
authors.affiliation: Division of Colon and Rectal Surgery, Shizuoka Cancer Center Hospital, 1007 Shimonagakubo, Nagaizumi-cho, Sunto-gun, Shizuoka, 411-8777, Japan. a.shiomi@scchr.jp.
authors.forename: Akio
authors.initials: A
authors.lastname: Shiomi
authors.affiliation: Division of Colon and Rectal Surgery, Shizuoka Cancer Center Hospital, 1007 Shimonagakubo, Nagaizumi-cho, Sunto-gun, Shizuoka, 411-8777, Japan. h.kagawa@scchr.jp.
authors.forename: Hiroyasu
authors.initials: H
authors.lastname: Kagawa
authors.affiliation: Division of Colon and Rectal Surgery, Shizuoka Cancer Center Hospital, 1007 Shimonagakubo, Nagaizumi-cho, Sunto-gun, Shizuoka, 411-8777, Japan. y.yamakawa@scchr.jp.
authors.forename: Yushi
authors.initials: Y
authors.lastname: Yamakawa
authors.affiliation: Division of Colon and Rectal Surgery, Shizuoka Cancer Center Hospital, 1007 Shimonagakubo, Nagaizumi-cho, Sunto-gun, Shizuoka, 411-8777, Japan. ma.numata@scchr.jp.
authors.forename: Masakatsu
authors.initials: M
authors.lastname: Numata
authors.affiliation: Division of Endoscopy, Shizuoka Cancer Center Hospital, 1007 Shimonagakubo, Nagaizumi-cho, Sunto-gun, Shizuoka, 411-8777, Japan. sh.sugimoto@ise.jrc.or.jp.
authors.forename: Shinya
authors.initials: S
authors.lastname: Sugimoto
authors.affiliation: Division of Endoscopy, Shizuoka Cancer Center Hospital, 1007 Shimonagakubo, Nagaizumi-cho, Sunto-gun, Shizuoka, 411-8777, Japan. ke.imai@scchr.jp.
authors.forename: Kenichiro
authors.initials: K
authors.lastname: Imai
authors.affiliation: Division of Endoscopy, Shizuoka Cancer Center Hospital, 1007 Shimonagakubo, Nagaizumi-cho, Sunto-gun, Shizuoka, 411-8777, Japan. k.hotta@scchr.jp.
authors.forename: Kinichi
authors.initials: K
authors.lastname: Hotta
authors.affiliation: Division of Pathology, Shizuoka Cancer Center Hospital, 1007 Shimonagakubo, Nagaizumi-cho, Sunto-gun, Shizuoka, 411-8777, Japan. k.sasaki@scchr.jp.
authors.forename: Keiko
authors.initials: K
authors.lastname: Sasaki
keywords: Aberrant; Adenocarcinoma; Ectopic; Heterotopic; Jejunum; Pancreas