Correct!
2. The thoracic CT shows a subcarinal mediastinal mass

The thoracic CT shows normal pleural surfaces and the chest wall appears normal; no evidence of bone destruction or chest wall mass is present. The diaphragmatic contours, visible on the coronal images, appear normal; no evidence of intrathoracic herniation of abdominal contents is seen. A mediastinal mass, representing the lesion seen at chest radiography, is present, located in the subcarinal region (Figure 4).

Figure 4. Axial (A-F) and coronal (G-J) enhanced thoracic CT shows a homogeneous mass (*) in the subcarinal region.
There is no evidence of either peribronchial or mediastinal lymph node enlargement outside the subcarinal region.

Regarding the thoracic CT examination, which of the following is correct? (Click on the correct answer to proceed to the fourth of seven panels)

1. The thoracic CT shows that the subcarinal mediastinal lesion is cystic
2. The thoracic CT shows that the subcarinal mediastinal lesion is enhancing
3. The thoracic CT shows that the subcarinal mediastinal lesion is homogeneous
4. The thoracic CT shows that the subcarinal mediastinal lesion is necrotic
5. The thoracic CT shows that the subcarinal mediastinal lesion possess locally aggressive behavior

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