A 33-year-old male with a chest lesion on a routine chest radiograph. Pulmonary arteriovenous malformation (PAVM).

A 33-year-old Bahraini male presented at the health centre for a chest radiograph as a part of a routine medical check up for employment. He had no complaints. There was no history of a hospital visit or other major illness. After routine chest radiograph (Figure 1) he underwent a contrast-enhanced CT scan (Figures 2a, 2b) of the chest, as a part of further work-up for the lesion detected on the chest radiograph.

Figure 1

Chest radiograph showing a lobulated mass of uniform density in the right lower hemithorax with connecting vessels radiating to the hilum.

Figure 2a, 2b

Contrast-enhanced chest CT scans demonstrating a lobulated enhancing subpleural mass with feeding artery and draining vein.

What does the routine chest radiograph show?

What would be the likely differentials based on the findings of the routine chest radiograph?

What are the findings on contrast-enhanced CT scan of the chest?

What other radiological test could demonstrate this lesion?