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Congenital unilateral absence of a pulmonary artery: a report of two adult cases.

Congenital unilateral absence of a pulmonary artery (UAPA) is a rare anomaly that is generally diagnosed in childhood and frequently associated with other cardiovascular abnormalities. Two patients with unilateral absence of a pulmonary artery first diagnosed as adults are reported. Our two cases demonstrate that presentation of UAPA may range from an incidental finding to chronic, life-threatening symptoms. Because UAPA may require urgent intervention, physicians should be alerted to the possibility of this entity presenting later in life.