At low power, the extent of the necrosis with acute pancreatitis is seen here. The mid-lower portion of the photograph also demonstrates hemorrhage that is typical of this process. Many cases of acute pancreatitis are associated with biliary tract lithiasis in which a gallstone traverses the common bile duct to impact into the ampulla of Vater, resulting in pancreatic duct obstruction (when the pancreatic duct and common bile duct merge prior to the ampulla).