TABLE 3:

Revised Atlanta Criteria–Defined Fluid Collections and Their Imaging Features [27]

Pancreatitis Type, Fluid Collection Type	Imaging Features
Interstitial edematous pancreatitis
Acute peripancreatic fluid collection (APFC)	No defined wall; peripancreatic in location; conforms to adjacent spaces; homogeneous; no solid or semisolid material
Pseudocyst	Same as APFC, but with defined wall, typically more than 4 wk from onset
Necrotizing pancreatitis
Acute necrotic collection (ANC)	No defined wall; pancreatic and/or peripancreatic in location; may be transspatial; contains fluid, nonliquified debris, fat globules, or loculations
Walled-off necrosis	Same as ANC, but with defined wall, typically more than 4 weeks from onset