1. A 55-year-old woman presents with a palpable abdominal mass. Imaging reveals a well-circumscribed, hyperenhancing mass in the tail of the pancreas. She undergoes a distal pancreatectomy. The tumor shows nests and cords of polygonal cells with abundant clear cytoplasm and bland nuclei with prominent nucleoli. The tumor is also found to express PAX8 and CD10. What is the most likely diagnosis?