Final answer:
Right coronary aortic valve leaflet prolapse is most likely seen in a patient with patent ductus arteriosus.
Step-by-step explanation:
Right coronary aortic valve leaflet prolapse occurs when one of the cusps of the valve is forced backward by the force of the blood, causing the closure mechanism to fail. This disrupts the normal one-way flow of blood and results in regurgitation, where the blood flows backward from its normal path. This condition is most likely seen in a patient with patent ductus arteriosus, which is the failure of the ductus arteriosus to close.