title: Intussusception due to rectal adenocarcinoma in a young adult: a case report.
abstract: An intussusception due to colonic adenocarcinoma has sometimes been reported. However, to the best of our knowledge, reports of intussusception due to rectal adenocarcinoma are extremely rare. In this report, the case of a young man with rectal adenocarcinoma causing intussusception is described. A 24-year-old man visited a hospital complaining of abdominal pain, and an upper rectal cancer was diagnosed by colonoscopy. Computed tomography showed intussusception caused by a large tumor in the pelvis and absence of distant metastases. Locally advanced rectal cancer causing intussusception was diagnosed, and a low anterior resection was performed. Intraoperatively, repair of the invagination could not be accomplished easily; therefore, the repair was abandoned. Instead, the tumor was removed en bloc to avoid dissemination of the cancer. Histopathologically, the tumor was diagnosed as a poorly differentiated adenocarcinoma, pStage IIA. The patient has no evidence of recurrence at 10 mo after the operation.
authors.affiliation: Ryo Inada, Takeshi Nagasaka, Toshiaki Toshima, Yoshiko Mori, Yoshitaka Kondo, Hiroyuki Kishimoto, Toshiyoshi Fujiwara, Department of Gastroenterological Surgery, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8558, Japan.
authors.forename: Ryo
authors.initials: R
authors.lastname: Inada
authors.affiliation: Ryo Inada, Takeshi Nagasaka, Toshiaki Toshima, Yoshiko Mori, Yoshitaka Kondo, Hiroyuki Kishimoto, Toshiyoshi Fujiwara, Department of Gastroenterological Surgery, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8558, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Nagasaka
authors.affiliation: Ryo Inada, Takeshi Nagasaka, Toshiaki Toshima, Yoshiko Mori, Yoshitaka Kondo, Hiroyuki Kishimoto, Toshiyoshi Fujiwara, Department of Gastroenterological Surgery, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8558, Japan.
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Toshima
authors.affiliation: Ryo Inada, Takeshi Nagasaka, Toshiaki Toshima, Yoshiko Mori, Yoshitaka Kondo, Hiroyuki Kishimoto, Toshiyoshi Fujiwara, Department of Gastroenterological Surgery, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8558, Japan.
authors.forename: Yoshiko
authors.initials: Y
authors.lastname: Mori
authors.affiliation: Ryo Inada, Takeshi Nagasaka, Toshiaki Toshima, Yoshiko Mori, Yoshitaka Kondo, Hiroyuki Kishimoto, Toshiyoshi Fujiwara, Department of Gastroenterological Surgery, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8558, Japan.
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Kondo
authors.affiliation: Ryo Inada, Takeshi Nagasaka, Toshiaki Toshima, Yoshiko Mori, Yoshitaka Kondo, Hiroyuki Kishimoto, Toshiyoshi Fujiwara, Department of Gastroenterological Surgery, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8558, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Kishimoto
authors.affiliation: Ryo Inada, Takeshi Nagasaka, Toshiaki Toshima, Yoshiko Mori, Yoshitaka Kondo, Hiroyuki Kishimoto, Toshiyoshi Fujiwara, Department of Gastroenterological Surgery, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8558, Japan.
authors.forename: Toshiyoshi
authors.initials: T
authors.lastname: Fujiwara
mesh_terms: D015746:Abdominal Pain / Q000209:etiology; D000230:Adenocarcinoma / Q000737:chemistry / Q000150:complications* / Q000473:pathology / Q000601:surgery; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000627:therapeutic use; D014408:Biomarkers, Tumor / Q000032:analysis; D001706:Biopsy; D000069287:Capecitabine; D002454:Cell Differentiation; D017024:Chemotherapy, Adjuvant; D003113:Colonoscopy; D003841:Deoxycytidine / Q000008:administration & dosage / Q000031:analogs & derivatives; D005472:Fluorouracil / Q000008:administration & dosage / Q000031:analogs & derivatives; D006801:Humans; D007150:Immunohistochemistry; D007443:Intussusception / Q000175:diagnosis / Q000209:etiology* / Q000601:surgery; D008279:Magnetic Resonance Imaging; D008297:Male; D009367:Neoplasm Staging; D009944:Organoplatinum Compounds / Q000008:administration & dosage; D000077150:Oxaliplatin; D010071:Oxaloacetates; D012004:Rectal Neoplasms / Q000737:chemistry / Q000150:complications* / Q000473:pathology / Q000601:surgery; D016896:Treatment Outcome; D055815:Young Adult
chemical_list: D014408:Biomarkers, Tumor; D009944:Organoplatinum Compounds; D010071:Oxaloacetates; D000077150:Oxaliplatin; D003841:Deoxycytidine; D000069287:Capecitabine; D005472:Fluorouracil
keywords: Adult intussusception; En bloc resection; Low anterior resection; Rectal adenocarcinoma; Young cancer