An 8-year-old boy with ASD presents to a pediatrician

An 8-year-old boy with ASD presents to a pediatrician. This congenital heart defect
shunts blood from the left atrium to the right atrium and causes hypertrophy of the
right atrium, right ventricle, and pulmonary trunk. Which of the following veins opens
into the hypertrophied atrium?

(A) Middle cardiac vein
(B) Small cardiac vein
© Oblique cardiac vein
(D) Anterior cardiac vein
(E) Right pulmonary vein

The answer is D. The anterior cardiac vein drains into the right atrium. The middle, small,
and oblique cardiac veins drain into the coronary sinus. The right and left pulmonary
veins drain into the left atrium.