Macroscopic pancreatic heterotopia on a congenital biliary dilatation.

Pancreatic heterotopia is generally asymptomatic and occurs in gut-related sites. An antenatally detected subhepatic cyst was finally diagnosed to be a congenital biliary cystic dilatation (without a caudal duodenal communication) with macroscopic Heinrich Type 2 pancreatic heterotopia. The embryogenesis and pathology of the malformation are discussed.