Pancreas divisum is the most common birth defect of the pancreas. In many cases, this defect goes undetected and causes no problems. The cause of the defect is unknown.
As a baby develops in the womb, two separate pieces of tissue join together to form the pancreas. Each part has a tube, called a duct. When the parts join together, a final duct, called the pancreatic duct, is formed. Fluid and digestive juices (enzymes) produced by the pancreas normally flow through this duct.
If the ducts do not join while the baby is developing in the womb, pancreas divisum results. Fluid from the two parts of the pancreas drains into separate areas of the upper portion of the small intestine (duodenum). This occurs in 5 to 15% of people.
If a pancreatic duct becomes blocked, swelling and tissue damage (pancreatitis) may develop.