Question: A 66-year-old woman was referred to our hospital for an incidentally discovered abdominal mass during routine physical examination. She had no history of abdominal trauma, liver cirrhosis, or chronic hepatitis virus infection previously, nor did she have of abdominal pain, jaundice, or cholangitis. Physical examination revealed mild tenderness of the right upper abdominal quadrant. Blood test results, including complete blood count, liver function tests, and tumor markers of carbohydrate antigen 19-9, alpha fetoprotein, and carcinoembryonic antigen were all within normal ranges.