A benign, non-metastasizing cystic epithelial neoplasm arising from the exocrine pancreas. It is composed of glycogen-rich epithelial cells which produce a watery fluid. Signs and symptoms include abdominal mass, abdominal pain, nausea, vomiting, and weight loss. The disease is pancreatic serous cystadenoma (MONDO_0002808). Also known as: pancreas serous cystadenoma, pancreatic microcystic adenoma, serous cystadenoma of pancreas, serous cystadenoma of the pancreas.