The Utility of Gallbladder Absence on Ultrasound for Children With Biliary Atresia

Area of Science:

• Pediatric Gastroenterology
• Diagnostic Imaging
• Neonatal Surgery

Background:

• Biliary Atresia (BA) is a critical congenital condition causing infant bile duct obliteration.
• Untreated BA leads to cholestasis, cirrhosis, and potentially fatal outcomes.
• Early diagnosis is crucial for effective management and improved prognosis.

Purpose of the Study:

• To evaluate the diagnostic accuracy of an absent gallbladder on ultrasound (US) for predicting Biliary Atresia (BA) in infants with cholestasis.
• To determine the sensitivity, specificity, and predictive values of sonographic gallbladder absence in diagnosing BA.

Main Methods:

• Retrospective chart review of 61 infants with cholestasis.
• Blinded interpretation of ultrasounds by a pediatric radiologist.
• Statistical analysis, including Fisher exact test, to assess predictive utility.

Main Results:

• Absent gallbladder on US accurately predicted absent gallbladder (77% accuracy, 92% sensitivity, 73% specificity).
• For diagnosing BA, absent gallbladder showed 66% accuracy, 53% sensitivity, 94% specificity, and 96% positive predictive value (PPV).
• The negative predictive value (NPV) for BA diagnosis was 46% (P < 0.001).

Conclusions:

• Sonographic absence of the gallbladder is a highly specific indicator for Biliary Atresia.
• High PPV suggests its utility in confirming BA when observed.
• Low sensitivity and NPV indicate that an absent gallbladder on US is insufficient to rule out BA.