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1379 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?

AAbnormal septation of the sinus venosus
BAbnormal development of the septum secundum
CAbnormal development of the left sinus horn
DAbnormal development of the coronary sinus
Anatomy
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