Pancreatic pseudocysts are fluid-filled sacs that develop within the
pancreatic tissue or the surrounding pancreatic space. They are
characterized by a non-epithelialized wall composed of fibrous and
granulation tissue, hence the term “pseudo” cyst. These sacs are
encapsulated collections of homogeneous fluid with minimal or no
necrotic tissue within them. They are filled with amylase rich fluid.
Typically, pancreatic pseudocysts are well-defined and situated
outside the pancreas, often in the lesser sac. About one-third of
pseudocysts are located near the head of the gland, and the remaining
two-thirds occur in the tail. The pathogenesis of a pseudocyst
formation in chronic pancreatitis is not well understood, but it may
involve acute exacerbation of underlying pancreatitis with new
calculus or protein plug formation in the pancreatic ducts