第 73 題

Oh, you actually got one right. A rare moment of clarity.

1. Basic Recognition: So, you did manage to correctly pinpoint the Left Atrium at the 1 to 2 o'clock direction on a lateral radiograph. Yes, that's precisely where you'd expect to see the left atrium, nestled postero-dorsally at the heart's base. And when that chamber decides to hypertrophy, just like in your garden-variety geriatric Poodle with its alarmingly common mitral regurgitation? It protrudes, pushes against the main bronchus. A classic sign, if one bothers to look.
2. Minimal Expectations Met: This wasn't rocket science, despite your probable struggles. A Medium difficulty, at best. It required more than just blindly regurgitating clock positions; you had to distinguish the left atrium from the left auricle, which, for your information, prefers a different 'time' slot on a VD view. Your ability to correctly identify this feature suggests a marginally acceptable grasp of anatomical interpretation. Don't get conceited; the next question might actually demand critical thinking.