1. A 62-year-old woman undergoes an abdominal CT for evaluation of abdominal pain. A well-defined, low-attenuation cystic mass is seen in the tail of the pancreas. The mass has delicate septa and contains numerous small cysts, some of which are larger toward the periphery. There is a central stellate scar containing a “sunburst” pattern of calcifications. What is the most likely diagnosis?