Figure 3.
The two panels are labelled a and b. Panel a shows a P A chest radiograph with the letter R marking the right side. An irregular opacity with central lucency is in the right mid-lung zone. The cardiac silhouette and both lung fields are evident. Panel b shows an axial C T image of the chest. A thick-walled cavitary lesion with surrounding consolidation is present in the right lung. The heart, mediastinum, ribs, and lung parenchyma are clearly visualised in cross-section.Difference between general X-ray image and CT: (a) general chest X-ray image, (b) chest CT image