On an axial CT of the lower thorax, a portion of right lung is seen extending medially into the angle between the oesophagus and the azygos vein. This recess is known as the:
- A Retrosternal recess
- B Subphrenic recess
- C Azygo-oesophageal recess ✓
- D Superior costomediastinal recess
Correct answer: C. Azygo-oesophageal recess
Explanation
The azygo-oesophageal recess is formed where the right lung projects into the mediastinum between the oesophagus anteriorly and the azygos vein posteriorly, and it is a standard landmark on axial chest CT. The retrosternal recess involves lung and the anterior mediastinum behind the sternum, while the costomediastinal recesses lie beside the heart and thymus, not against the oesophagus.
Reference: Gray's Anatomy, 42nd ed.
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