title: Multiple myeloma presenting as CEA-producing rectal cancer.
abstract: We report the case of a 57-year-old patient with multiple myeloma, characterized by extramedullary involvement of the rectum at presentation. Malignant plasma cells were found to produce carcinoembryonic antigen (CEA), a tumor antigen more commonly associated with rectal adenocarcinomas.
authors.affiliation: Penn State Hershey Cancer Institute, Hershey, PA, USA.
authors.forename: Giampaolo
authors.initials: G
authors.lastname: Talamo
authors.forename: Amitkumar
authors.initials: A
authors.lastname: Barochia
authors.forename: Maurizio
authors.initials: M
authors.lastname: Zangari
authors.forename: Thomas P
authors.initials: TP
authors.lastname: Loughran