Similarities and differences between an ANC and WON

What are the similarities and differences between an ANC and WON? 

Both collections can be intrapancreatic or extrapancreatic, associated with necrotizing pancreatitis, and contain variable amounts of fluid and solid necrotic tissue. An ANC occurs within the first 4 weeks and does not have a definable wall encapsulating the collection. WON occurs 4 weeks or more after the onset of necrotizing pancreatitis and is a mature, encapsulated collection with a well-defined inflammatory wall.


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