Depending on recipe and cooking method it may be either a flaky potato pie, or a heavy potato pudding.
Ductus arteriosus: A short vessel through which blood headed from the heart via the pulmonary artery to the lungs is shunted before birth. This blood is shunted away from the lungs and returned to the aorta. When the shunt is open, it is said to be patent.
Patent ductus arteriosus is a congenital heart condition in which the ductus, a small opening or pathway between the pulmonary and aortic valves, remains open or patent. In most cases, the ductus closes within a day after birth.