Posteroanterior chest radiographs showing a large right pneumothorax

The left-hand image represents a conventional radiograph. A large right pneumothorax is demonstrated. The visceral pleural line is marked by red arrows. The lack of vascular and pulmonary markings in the periphery should be noted. The right-hand image represents the negative image of the film on the left. The pneumothorax is more clearly seen in this view.