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 (PDA) is a relatively common congenital heart defect in the United States. The condition occurs more often in premature infants (on average, occurring in about 8 of every 1,000 births).