title: Mixed Adenoneuroendocrine Carcinoma Causing Colonic Intussusception.
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).
authors.affiliation: Colorectal Unit, Department of Surgery, Sao João Medical Center, Faculty of Medicine, The University of Porto, 4200-319 Porto, Portugal.
authors.forename: Marina
authors.identifier: 0000-0002-6765-1233
authors.initials: M
authors.lastname: Morais
authors.affiliation: Colorectal Unit, Department of Surgery, Sao João Medical Center, Faculty of Medicine, The University of Porto, 4200-319 Porto, Portugal.
authors.forename: André Costa
authors.initials: AC
authors.lastname: Pinho
authors.affiliation: Department of Anatomic Pathology, Sao João Medical Center, Faculty of Medicine, The University of Porto, 4200-319 Porto, Portugal.
authors.forename: Ana
authors.initials: A
authors.lastname: Marques
authors.affiliation: Department of Anatomic Pathology, Sao João Medical Center, Faculty of Medicine, The University of Porto, 4200-319 Porto, Portugal.
authors.forename: Joanne
authors.initials: J
authors.lastname: Lopes
authors.affiliation: Colorectal Unit, Department of Surgery, Sao João Medical Center, Faculty of Medicine, The University of Porto, 4200-319 Porto, Portugal.
authors.forename: Alexandre
authors.initials: A
authors.lastname: Duarte
authors.affiliation: Colorectal Unit, Department of Surgery, Sao João Medical Center, Faculty of Medicine, The University of Porto, 4200-319 Porto, Portugal.
authors.forename: Pedro Correia
authors.initials: PC
authors.lastname: da Silva
authors.affiliation: Department of Anatomic Pathology, Sao João Medical Center, Faculty of Medicine, The University of Porto, 4200-319 Porto, Portugal.
authors.forename: José Manuel
authors.initials: JM
authors.lastname: Lopes
authors.affiliation: Colorectal Unit, Department of Surgery, Sao João Medical Center, Faculty of Medicine, The University of Porto, 4200-319 Porto, Portugal.
authors.forename: J Costa
authors.initials: JC
authors.lastname: Maia