In the revised Atlanta Classification (2012) of acute pancreatitis, a collection with a well-defined wall arising after 4 weeks from necrotising pancreatitis involving both pancreatic parenchyma and peripancreatic tissue is termed:

• A Acute peripancreatic fluid collection
• B Pancreatic pseudocyst
• C Acute necrotic collection
• D Walled-off necrosis ✓

Explanation

The revised Atlanta Classification (2012) defines four morphological entities: (1) acute peripancreatic fluid collection — early, no necrosis, no defined wall; (2) pancreatic pseudocyst — encapsulated fluid after interstitial oedematous pancreatitis; (3) acute necrotic collection — early, necrosis of parenchyma or peripancreatic tissue; (4) walled-off necrosis (WON) — encapsulated necrotic collection ≥4 weeks after necrotising pancreatitis. WON requires drainage if infected, preferably by endoscopic or minimally invasive means.

Reference: Bailey & Love's Short Practice of Surgery, 27th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.