Pictorial Review of Congenital Anomalies of the Gallbladder and Biliary Ducts: Findings on Hepatobiliary Iminodiacetic Acid Scan

Objectives 1. To become familiar with the imaging appearance on Hepatobiliary Iminodiacetic Acid (HIDA) scan of congenital gallbladder and biliary duct anomalies. 2. To understand the diagnostic utility of functional imaging with HIDA when evaluating biliary tract anomalies. SUMMARY: HIDA scan is a very valuable tool for functional assessment of the biliary tract. However, congenital biliary tract anomalies are rare and can be challenging to recognize on HIDA imaging. Focusing on HIDA scans in conjunction with correlative anatomic imaging, we will review the imaging appearances of congenital gallbladder anomalies including congenital biliary atresia, gallbladder hypoplasia and gallbladder duplication. The associations of congenital gallbladder anomalies with other biliary and gastrointestinal tract malformations will be summarized. We will also review the imaging appearance of congenital biliary duct anomalies (including choledochal cyst and accessory biliary ducts variants), and discuss the implications of HIDA and correlative imaging in pre-operative surgical planning. By showing side-by-side comparisons, we aim to illustrate the added utility of HIDA in conjunction with anatomic imaging in the evaluation of biliary duct anomalies.

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