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The evolution of the pancreatic necrosis and well-encapsulated walled-off necrosis. (a) The encapsulation was not completed 10 days after onset. (b,c) The peripancreatic fluid collection formed an encapsulation (arrow) within two weeks of the onset. (d) This patient developed infected walled-off necrosis with a cavity containing air bubbles (arrowhead) that needed drainage at day 68 after the onset of pancreatitis.
