A Congenital Choledochal Cyst in an Adolescent: A Unique Case Report and the Role Liver-Specific Contrast Agents in the Diagnosis of Challenging Cases.

Choledochal cysts are rare congenital cystic dilatations of the biliary tree. They are most commonly present in female infants and young children, and their pathology remains unclear. The triad of intermittent jaundice, abdominal mass, and pain is found only in a minority of patients. Diagnosis and delineation of accurate biliary anatomy are crucial for surgical planning. This is most often successfully achieved with ultrasound and magnetic resonance cholangiopancreatography. The definitive treatment is cyst excision which decreases the risk of biliary carcinoma. We present an unusual case of a choledochal cyst in an adolescent boy with a review of the literature and emphasis on multi-imaging modalities, including the role of liver-specific gadolinium contrast agents in challenging cases to confirm the diagnosis.