Answer to A Joker in Every Crowd
Correct answer is B. The esophagus is a midline structure and its density appears somewhat clear in a conventional PA chest film. It is also present in the CT images just posterior to the trachea.
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Answer to this question is based on material presented in lectures 13 of the Thorax Lecture Series.
= Trachea
= Esophagus
= Arch of azygos
= Descending aorta
= Spines of vertebrae