title: Pathologic quiz case: a 79-year-old woman with a black, ulcerated cecal tumor and 3 negative guaiac test results. Medullary adenocarcinoma of the colon, poorly differentiated.
authors.affiliation: Department of Pathology, Charles R. Drew University of Medicine and Science, UCLA School of Medicine, MLK Jr/Drew Medical Center, 90059, USA. liwang@cdrewu.edu <liwang@cdrewu.edu>
authors.forename: Lina
authors.initials: L
authors.lastname: Wang
authors.forename: Nancy E
authors.initials: NE
authors.lastname: Warner
authors.forename: Andy E
authors.initials: AE
authors.lastname: Sherrod
mesh_terms: D000230:Adenocarcinoma / Q000097:blood / Q000175:diagnosis*; D000368:Aged; D018276:Carcinoma, Medullary / Q000097:blood / Q000175:diagnosis*; D002430:Cecal Neoplasms / Q000097:blood / Q000175:diagnosis*; D003110:Colonic Neoplasms / Q000097:blood / Q000175:diagnosis*; D005260:Female; D006138:Guaiac; D006801:Humans; D009780:Occult Blood; D014456:Ulcer / Q000097:blood / Q000175:diagnosis*
chemical_list: D006138:Guaiac