Classification of Pancreatic Fluid Collections

Interstitial Edematous Pancreatitis: 

 < 4 weeks - Acute (peri)panreatic fluid collection - Homogenous fluid adjacent to pancreas without a recognizable wall

 ≥ 4 weeks - Pancreatic pseudocyst - An encapsulated, well-defined, usually extrapancreatic fluid collection with minimal solids

Necrotizing pancreatitis:

 < 4 weeks - Acute necrotic collection - Intra and/or extra necrotic without a well-defined wall

 ≥ 4 weeks - Walled off necrosis - Intra and/or extra pancreatic necrotic collection with a well-defined wall



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