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Case Reports in Surgery
Volume 2016, Article ID 7684364, 5 pages
http://dx.doi.org/10.1155/2016/7684364
Case Report

Mixed Adenoneuroendocrine Carcinoma Causing Colonic Intussusception

1Colorectal Unit, Department of Surgery, Sao João Medical Center, Faculty of Medicine, The University of Porto, 4200-319 Porto, Portugal
2Department of Anatomic Pathology, Sao João Medical Center, Faculty of Medicine, The University of Porto, 4200-319 Porto, Portugal

Received 1 March 2016; Revised 20 June 2016; Accepted 22 June 2016

Academic Editor: Hirotoshi Kobayashi

Copyright © 2016 Marina Morais et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Colonic intussusception is a rare cause of intestinal obstruction in adults and is caused by a malignant lesion in about 70% of cases. Early diagnosis and treatment are essential. We present a 64-year-old male patient with right colonic intussusception caused by a mixed adenoneuroendocrine carcinoma (MANEC), presenting as a giant pedunculated polyp (54 mm of largest diameter). The patient underwent right colectomy with primary anastomosis and adjuvant chemotherapy. The diagnosis of intussusception of the colon in adults is difficult because of its rarity and nonspecific clinical presentation. In this case, the cause was a rare histological type malignant tumor (MANEC).