This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Radiology
Left cardiac border bulge can be seen in all, except – 
Select and explain. 
A. Enlarged azygous vein, B. Left appendicular overgrowth, C. Coronary artery aneurysm, D. Pericardial defect
A: Enlarged azygous vein
Answer: A: Enlarged azygous vein 
Explanation: Left cardiac border is slightly concave. Bulging (convexity) of left heart border is produced by : (1) Left atrial appendage enlargement; (2) Left ventricular enlargement; (3) Right ventricular enlargement; (4) Left anterior descending coronary artery aneurysm; (5) Left sided pericardial defect.