A 54-year-old woman has a long history of chronic hepatitis B infection and has had increasing malaise for the past year. She was hospitalized 1 year ago because of upper gastrointestinal hemorrhage. Physical examination now shows a firm nodular liver. Laboratory findings show a serum albumin level of 2.5 g/dL and a prothrombin time of 28 seconds. Which of the following additional physical examination findings is most likely to be present in this woman?