The right border of the heart on a chest radiograph is formed by which structure?
- A Right ventricle
- B Superior vena cava
- C Right atrium ✓
- D Ascending aorta
Correct answer: C. Right atrium
Explanation
The right border of the cardiac silhouette on a PA chest radiograph is formed by the right atrium in the lower two-thirds and the superior vena cava in the upper third. The right ventricle forms the anterior surface of the heart (sternocostal surface) and contributes to the inferior border. The left border is formed from above downward by the aortic knuckle, pulmonary trunk, left atrial appendage, and left ventricle.
Reference: BD Chaurasia's Human Anatomy, 8th ed.
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