Table 2.

The 2012 revision of the Atlanta classification of acute pancreatitis in adults

Types
Interstitial edematous pancreatitis
Acute necrotizing pancreatitis
Severity
Mild
Most common form (up to 80% of cases)
Absence of organ failure
Absence of local or systemic complications
Usually resolves in the first week
Moderately severe
Presence of transient organ failure <48 h
Local complications may be present
Severe
About 20% of cases
Persistent organ failure for >48 h
Local complications include peripancreatic fluid collections, pancreatic and peripancreatic necrosis (sterile or infected), pseudocyst and walled-off necrosis (sterile or infected)
Poor outcome
Phases
Early: usually lasts for 1 wk
Late: may follow a protracted course from weeks to months

Reprinted from reference 1, with permission.