A 57-year-old woman has had increasing abdominal enlargement for 6 months. During the past 2 days, she developed a high fever. On physical examination, her temperature is 38.5° C. The abdomen is enlarged and diffusely tender, and there is a fluid wave. Paracentesis yields 500 mL of cloudy yellowish fluid. The cell count is 532/μL with 98% neutrophils and 2% mononuclear cells. A blood culture is positive for Escherichia coli. The representative gross appearance of her liver is shown in the figure. Which of the following underlying diseases most commonly accounts for these findings?