Acute necrotic collection
Last revised by Jeremy Jones ◉ on 20 Sep 2021
Citation, DOI, disclosures and article data
Citation:
Knipe H, Shah V, Glick Y, et al. Acute necrotic collection. Reference article, Radiopaedia.org (Accessed on 31 May 2023) https://doi.org/10.53347/rID-35482
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35482
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Disclosures:
At the time the article was created Henry Knipe had no recorded disclosures.
View Henry Knipe's current disclosuresLast revised:
20 Sep 2021, Jeremy Jones ◉
Disclosures:
At the time the article was last revised Jeremy Jones had no recorded disclosures.
View Jeremy Jones's current disclosuresRevisions:
6 times, by 3 contributors - see full revision history and disclosures
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Synonyms:
- Acute necrotic collections
- Acute necrotic collections (ANCs)
- Acute necrotic collection (ANC)
- Acute necrotic collection
Acute necrotic collections (ANCs) are an early, local complication of necrotizing pancreatitis.
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Terminology
The following are the latest terms according to the updated Atlanta classification to describe fluid collections associated with acute pancreatitis 1,2:
- fluid collections in interstitial edematous pancreatitis
- acute peripancreatic fluid collections (APFC): in the first 4 weeks: non-encapsulated peripancreatic fluid collections
- pseudocysts: develop after 4 weeks; encapsulated peripancreatic or remote fluid collections
- fluid collections in necrotizing pancreatitis
- acute necrotic collections (ANCs): in the first 4 weeks; non-encapsulated heterogeneous non-liquefied material
- walled-off necrosis (WON or WOPN): develop after 4 weeks; encapsulated heterogeneous non-liquefied material
Pathology
Acute necrotic collections develop within the first four weeks and contain a variable amount of fluid/non-liquid necrotic material. They may be pancreatic or peripancreatic in location and can be sterile or infected.
Radiographic features
CT
On contrast-enhanced CT the following features are seen:
- heterogeneous, non-liquid density collection within the pancreas and/or peripancreatic tissues
- no defined capsule
- no peripheral enhancement
Differential diagnosis
- acute peripancreatic fluid collections (APFC): within the first week, differentiation between acute necrotic collections (ANC) and APFC may prove impossible
Quiz questions
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References
- 1. Thoeni RF. The revised Atlanta classification of acute pancreatitis: its importance for the radiologist and its effect on treatment. Radiology. 2012;262 (3): 751-64. doi:10.1148/radiol.11110947 - Pubmed citation
- 2. Banks PA, Bollen TL, Dervenis C et-al. Classification of acute pancreatitis-2012: revision of the Atlanta classification and definitions by international consensus. Gut. 2012;62 (1): 102-11. doi:10.1136/gutjnl-2012-302779 - Pubmed citation
- 3. (Ed.) Choi BI. Radiology Illustrated: Hepatobiliary and Pancreatic Radiology. Springer Berlin Heidelberg. ISBN:B00HYS9FSE. Read it at Google Books - Find it at Amazon
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