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Anatomy
A 5-year-old girl is brought to the emergency depament because of difficulty breathing (dyspnea), palpitations, and shoness of breath. Doppler study of the hea reveals an atrial septal defect (ASD). This malformation usually results from incomplete closure of which of the following embryonic structures?
Ductus aeriosus
Ductus venosus
Sinus venarum
Foramen ovale
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