A 60-year-old woman presents with persistent jaundice, pruritus, and dark urine for two weeks, in a background of nausea, vomiting, and intermittent upper abdominal pain for four weeks, and a 15kg weight loss over three months.
Her medical, surgical, allergic, and family histories are unremarkable. She only drinks socially, does not smoke, and has never used recreational drugs. There is no history of recent foreign travel.
A complete blood count is found to be within normal parameters.