<prompt> Most common complication of acute and chronic pancreatitis is:Pancreatic abscessPoal vein thrombosisPseudocystPancreatic head mass  <response>: Pseudocysts occur in up to 10 of patients with acute pancreatitis, and in 20 to 38 of patients with chronic pancreatitis, and thus, they comprise the most common complication of chronic pancreatitis. Ref Schwaz 9e p1200 