Pancreas divisum is the most common birth defect of the pancreas. In normal development, 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 chemicals (enzymes) produced by the pancreas normally flow through this duct. However, if the ducts fail to join together 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). If the pancreatic ducts become blocked, swelling and tissue damage (pancreatitis) may develop. Tests used to diagnose pancreas divism include: abdominal CT scan, amylase and lipase blood test, and ERCP.