Table 1.

Comparison of the Original and Revised Atlanta Classification

	Original Atlanta Classification (1993)	Revised Atlanta Classification (2012)
Acute pancreatitis	Interstitial pancreatitis	Interstitial edematous pancreatitis
	Sterile necrosis	Necrotizing pancreatitis (pancreatic necrosis and/or peripancreatic necrosis)
	Infected necrosis	Sterile necrosis
		Infected necrosis
Fluid collections during acute pancreatitis	Pancreatic pseudocyst	<4 Weeks after onset of acute pancreatitis
	Pancreatic abscess	Acute peripancreatic fluid collection (APFC)
		Sterile necrosis
		Infected necrosis
		Acute necrotic collection (ANC)
		Sterile necrosis
		Infected necrosis
		<4 Weeks after onset of acute pancreatitis
		Pancreatic pseudocyst (PP)
		Sterile necrosis
		Infected necrosis
		Walled-off pancreatic necrosis (WON)
		Sterile necrosis
		Infected necrosis