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Anatomy
A 2-day-old newborn male is admitted to the pediatric intensive care unit with cyanosis and tachypnea. Cardiac ultrasound and MRI examinations reveal totally anomalous pulmonary connections. Which of the following embryologic events is responsible for this malformation?
Abnormal septation of the sinus venosus
Abnormal development of the septum secundum
Abnormal development of the left sinus horn
Abnormal development of the coronary sinus
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