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.
The ductus arteriosus is a wide muscular blood vessel joining the pulmonary artery (main artery to the lungs) to the aorta (main artery to the body). This connection allows blood to be diverted from the lungs into the aorta during fetal development since the baby does not breathe until after delivery.