1. Interstitial edematous pancreatitis |
Acute inflammation of the pancreatic parenchyma and peripancreatic tissues, but without recognizable tissue necrosis Contrast-enhanced computed tomography criteria:
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2. Necrotizing pancreatitis |
Inflammation associated with pancreatic parenchymal necrosis and/or peripancreatic necrosis Contrast-enhanced computed tomography criteria:
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3. Acute peripancreatic fluid collection (APFC) |
Peripancreatic fluid associated with interstitial edematous pancreatitis with no associated peripancreatic necrosis. This term applies only to areas of peripancreatic fluid seen within the first four weeks after onset of interstitial edematous pancreatitis and without the features of a pseudocyst. Contrast-enhanced computed tomography criteria:
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4. Pancreatic pseudocyst |
An encapsulated collection of fluid with a well-defined inflammatory wall usually outside the pancreas with minimal or no necrosis. This entity usually occurs more than four weeks after onset of interstitial edematous pancreatitis to mature. Contrast-enhanced computed tomography criteria:
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5. Acute necrotic collection (ANC) |
A collection containing variable amounts of both fluid and necrosis associated with necrotizing pancreatitis; the necrosis can involve the pancreatic parenchyma and/or the peripancreatic tissues Contrast-enhanced computed tomography criteria:
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6. Walled-off necrosis (WON) |
A mature, encapsulated collection of pancreatic and/or peripancreatic necrosis that has developed a well-defined inflammatory wall. WON usually occurs >4 weeks after onset of necrotizing pancreatitis. Contrast-enhanced computed tomography criteria:
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