Which of the following group of three structures may cause apparent "constrictions" of the esophagus on an oblique chest radiograph after the patient has swallowed barium?
A) arch of the aorta, left main bronchus, diaphragm
B) arch of the azygos vein, left main bronchus, diaphragm
C) left brachiocephalic vein, arch of the azygos vein, diaphragm
D) arch of the aorta, left main bronchus, left main pulmonary vein
E) left brachiocephalic vein, arch of the aorta, left main pulmonary vein
Ans: A
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