Q52
Single choice
A75-year-old man is brought to the emergency department by his family for evaluation of jaundice. He complains of pruritus of 2 weeks' duration and a recent 10-lb weight loss. On examination, he is deeply jaundiced and has a nontender, globular mass in the right upper quadrant of the abdomen that moves with respiration. For above patient with jaundice, select the one most likely diagnosis.