An infant presents with a palpable abdominal mass and jaundice. Sonographically, a large cystic mass is seen near the porta hepatis. A normal gallbladder is also visualized separate from the cystic...

An infant presents with a palpable abdominal mass and jaundice. Sonographically, a large cystic mass is seen near the porta hepatis. A normal gallbladder is also visualized separate from the cystic mass. What is the most likely diagnosis?

a. Choledochal cyst

b. Caroli’s disease