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The choledochal ring sign: a specific finding in acute biliary pancreatitis
Eric Delabrousse1, Vincent Di Martino, Sébastien Aubry
1Service de Radiologie A, CHU Jean Minjoz, 3 bvd Alexander Fleming, 25030, Besançon, France. eric.delabrousse@orange.fr
Abdominal Imaging
|April 17, 2007
Summary
A new CT scan finding, the "choledochal ring" sign, accurately identifies biliary pancreatitis in patients with acute pancreatitis. This sign demonstrates 100% specificity and positive predictive value for biliary pancreatitis.
Area of Science:
- Radiology
- Gastroenterology
- Medical Imaging
Background:
- Acute pancreatitis is a common condition with various etiologies.
- Biliary pancreatitis is a frequent cause, necessitating accurate diagnostic methods.
- Distinguishing biliary pancreatitis aids in appropriate clinical management.
Purpose of the Study:
- To evaluate the diagnostic accuracy of a specific CT finding, the "choledochal ring" sign, in identifying biliary pancreatitis.
- To determine the specificity and positive predictive value of the "choledochal ring" sign.
- To compare the efficacy of the "choledochal ring" sign against other established indicators of biliary pancreatitis.
Main Methods:
- Retrospective review of contrast-enhanced CT scans from 80 patients with confirmed acute pancreatitis.
- Assessment by two independent gastrointestinal radiologists blinded to the pancreatitis etiology.
- Quantitative measurement of CT numbers to define the "choledochal ring" sign (difference > 15 HU between common bile duct wall and pancreatic parenchyma).
- Univariate and multivariate analyses to compare the sign with other biliary pancreatitis factors.
Main Results:
- The "choledochal ring" sign demonstrated 100% specificity in identifying biliary pancreatitis.
- The "choledochal ring" sign showed a 100% positive predictive value.
- This sign proved to be a highly accurate indicator compared to other associated factors.
Conclusions:
- The "choledochal ring" sign is a novel and precise CT finding for diagnosing acute biliary pancreatitis.
- This sign offers a valuable tool for radiologists in the evaluation of acute pancreatitis.
- The high specificity and PPV support its routine use in clinical practice.
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