Stephen Thomas1, Rina P Patel2, Aytekin Oto3. 1. University of Chicago Medical Center Department of Radiology, 5841 South Maryland Avenue, MC 2026, Chicago, IL 60637. Electronic address: sthomas@hotmail.com. 2. University of Chicago Medical Center Department of Radiology, 5841 South Maryland Avenue, MC 2026, Chicago, IL 60637. Electronic address: rinappatel@gmail.com. 3. University of Chicago Medical Center Department of Radiology, 5841 South Maryland Avenue, MC 2026, Chicago, IL 60637. Electronic address: aoto@radiology.bsd.uchicago.edu.
Abstract
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.
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.