Pancreatic pseudocysts are the most common cystic lesions of the pancreas, accounting for 75-80% of such masses. A pancreatic pseudocyst is a collection of amylase-rich, lipase-rich, and enterokinase-rich fluid. It is most frequently located in the lesser peritoneal sac in proximity to the pancreas. Large pseudocysts can extend into the paracolic gutters; pelvis; mediastinum; and, rarely, to the neck or scrotum. Some pseudocysts in the pancreatic parenchyma are loculated. The most common etiologies for pancreatic pseudocysts include chronic pancreatitis, acute pancreatitis, and pancreatic trauma. In addition, pseudocysts are associated with pancreatic ductal obstruction and pancreatic neoplasms.......more