Table 5.

Revised nomenclature of acute pancreatitis, based on CECT

Interstitial oedematous pancreatitis:

Acute inflammation of the pancreatic parenchyma and peripancreatic tissues without necrosis

CECT criteria:

•Homogeneous pancreatic parenchyma enhancement •No evidence of necrosis •May be associated with APFC or pseudocyst

Necrotizing pancreatitis:

Inflammation associated with pancreatic and/or peripancreatic necrosis

CECT criteria:

•Areas of non-enhancing pancreatic parenchyma •Presence of peripancreatic necrosis (ANC or WON)

Acute peripancreatic fluid collection (APFC):

Peripancreatic fluid associated with interstitial oedematous pancreatitis in first 4 weeks

CECT criteria:

•Homogeneous collection of fluid density •No definable wall

Pancreatic pseudocyst:

Peripancreatic fluid collection associated with interstitial oedematous pancreatitis after 4 weeks

CECT criteria:

•Homogeneous fluid density collection •Presence of well-defined wall •No solid component

Acute necrotic collection (ANC)

Peripancreatic collection associated with necrotizing pancreatitis in first 4 weeks

CECT criteria:

•Heterogeneous collection with non-liquid density •No perceptible wall •May be intrapancreatic and/or extrapancreatic

Walled-off necrosis (WON):

Peripancreatic collection associated with necrotizing pancreatitis after 4 weeks

CECT criteria:

•Heterogeneous collection with liquid and non-liquid density •Presence of well-defined wall