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Back to INI-CET 2024

INI-CET 2024 — Anatomy

Q: In the shown lateral view, the structure marked with arrowhead is?

Trachea. ***Trachea*** - This is a lateral view of the thorax, and the **trachea** is the most anterior conduit in the superior mediastinum, visible as an **air-filled structure** anterior to the esophagus. - The arrowhead points to a vertical air column in the anterior aspect, consistent with the expected anatomical location and appearance of the **trachea**. *Pulmonary artery* - The **pulmonary artery** lies anterior to the main bronchi and usually branches before this level, and it is a vascular structure, not an air-filled lumen. - It would appear as a soft tissue density, not a radiolucent (dark) air-filled structure on an X-ray. *Left atrium* - The **left atrium** is located posteriorly to the ascending aorta and pulmonary artery, and it is a cardiac chamber, not an air-filled tubular structure. - It is also a soft tissue density and would not be visible as a distinct air-filled lumen on a lateral chest X-ray in this position. *Esophagus* - The **esophagus** is located posterior to the trachea, running behind it in the mediastinum. - While it is a tubular structure, it is usually not air-filled unless there is swallowed air or a pathology (e.g., hiatus hernia), and it would be located *behind* the structure indicated by the arrowhead.

11 Questions — Page 2 of 2

Q11

In the shown lateral view, the structure marked with arrowhead is?