title: Image of the month-quiz case. Diagnosis: primary adenocarcinoma.
authors.affiliation: Department of Surgery, University of Southern California, Los Angeles, CA, USA.
authors.forename: Joshua L
authors.initials: JL
authors.lastname: Chan
authors.forename: Howard
authors.initials: H
authors.lastname: Silberman
mesh_terms: D000230:Adenocarcinoma / Q000175:diagnosis*; D005706:Gallbladder Neoplasms / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008875:Middle Aged