title: Traditional serrated adenoma of the sigmoid colon with osseous metaplasia: a case report.
abstract: BACKGROUND
  Osseous metaplasia in the gastrointestinal tract is a rare phenomenon.
  
  
  METHODS
  We present the case of a 62-year-old Hispanic man with two colonic polypoid lesions, one of which, upon resection and histopathological examination, was found to be a traditional serrated adenoma with a focus of stromal osseous metaplasia.
  
  
  CONCLUSIONS
  Our patient's case is the third report of stromal osseous metaplasia in a traditional serrated adenoma of the sigmoid colon.
authors.affiliation: Servicio de Patología, Hospital Metropolitano, Av, Mariana de Jesús s/n y Nicolás Arteta, Quito, Ecuador. nmontalvof@gmail.com.
authors.forename: Nelson F
authors.initials: NF
authors.lastname: Montalvo
authors.forename: José N
authors.initials: JN
authors.lastname: Beltrán
authors.forename: Ligia A
authors.initials: LA
authors.lastname: Redrobán