Endoscopic ultrasonography-guided endoscopic treatment of pancreatic pseudocysts and walled-off necrosis: New technical developments

Table 1 Modified according to the updated Atlanta classification for definition of peripancreatic fluid collections based on contrast enhanced computed tomography criteria[1]

	Acute phase < 4 wk	Late phase > 4 wk
Interstitial oedematous pancreatitis	Acute peripancreatic fluid collection (homogenous with fluid density, no definable wall, no necrosis, adjacent to pancreas, not intra-pancreatic)	Pancreatic pseudocyst (well circumscribed, usually round or oval, homogenous fluid density, no debris, well defined wall)
Necrotising pancreatitis	Acute necrosis (heterogenous and also non-liquid density, no definable wall, intra- and/or extrapancreatic location)	Walled-off necrosis (heterogenous and also non-liquid density, well defined wall, completely encapsulating, intra- and/or extrapancreatic location)