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Resolution of pneumobilia as a predictor of biliary stent occlusion
Stephen Thomas1, Rina P Patel1, Aytekin Oto1
1University of Chicago Medical Center Department of Radiology, 5841 South Maryland Avenue, MC 2026, Chicago, IL 60637.
Objective:
To predict biliary stent occlusion on computed tomography (CT) from the loss of pneumobilia.
Methods:
A total of 66 patients with common bile duct stents with pneumobilia after initial stent placement had a follow-up CT and diagnostic endoscopic retrograde cholangiopancreatography (ERCP). Two readers evaluated all CT exams for pneumobilia. Resolution or decrease of pneumobilia on CT was compared with ERCP findings.
Results:
Sensitivity and specificity was 60-64% and 95% with a positive predictive value of 97% and a negative predictive value of 49-51%.
Conclusion:
Resolution or reduction of pneumobilia after stent placement is specific (95%) and is moderately accurate (70-73%) for predicting biliary stent occlusion.
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