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.