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Patent ductus arteriosus (PDA) is a persistent opening between two major blood vessels leading from the heart. The opening, called the ductus arteriosus, is a normal part of a baby's circulatory system before birth that usually closes shortly after birth.
Pathology. Patent urachus represents the failure of the entire course of the urachus to close resulting in an open channel between the bladder and the umbilicus. A patent urachus is usually diagnosed neonates when urine is noted leaking from the umbilicus.A patent urachus may present later in life and it can become infected.atent urachus represents the failure of the entire course of the urachus to close resulting in an open channel between the bladder and the umbilicus.