Answer to Call Your Mother, but not When Driving

Correct answer is E. The location indicated is just to the left of the xiphisternal junction. At this location the cardiac notch displaces the left parietal pleural, permitting the opportunistic entry into the pericardium without damaging pleura and causing a pneumothorax.

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Answer to this question is based on material presented in lectures 5 of the Thorax Lecture Series.