Endoscopic ultrasound-guided drainage of pancreatic fluid collections

Table 1 Classification of pancreatic fluid collections

Term	Definition
Acute fluid collection	A collection of enzyme-rich pancreatic juice occurring early (within 48 h) in the course of acute pancreatitis, located in or near the pancreas and always lacking a well-defined wall of granulation tissue or fibrous tissue
Acute pseudocyst	A collection of pancreatic juice enclosed by a wall of nonepithelialized granulation tissue, arising as a consequence of acute pancreatitis, requiring at least 4 wk to form and devoid of significant solid debris
Chronic pseudocyst	A collection of pancreatic juice enclosed by a wall of fibrous or granulation tissue, arising as a consequence of chronic pancreatitis
Early pancreatic necrosis	A diffuse or focal area of nonviable pancreatic parenchyma greater than 30% of the gland by CT-scan, typically associated with peripancreatic fat necrosis
Late organized pancreatic necrosis	Evolution of acute necrosis to a partially encapsulated, well-defined collection of pancreatic juice and necrotic debris
Pancreatic abscess	A circumscribed intra-abdominal collection of pus, usually in proximity to the pancreas, containing little or no pancreatic necrosis, arising as a consequence of acute pancreatitis or pancreatic trauma