A 65-year-old man presents with shortness of breath and fever. A chest X-ray is provided.

Shortness of breath

1. State the main pathology demonstrated. 1 mark

2. List three radiological abnormalities to support your diagnosis. 3 marks

3. List three differential diagnoses for this problem. 3 marks

4. List and justify five further investigations you might perform to establish the diagnosis. 5 marks