Fig. 19
A pneumatocele mimicking inferior pulmonary ligament (IPL) air collection of a 61-year-old man. He has right main bronchial stricture treated under positive pressure ventilation. a A supine radiograph shows an oval lucency (black arrows), which represents a left lower lobe pneumatocele, in the left paramediastinal area. A pneumothorax (white asterisk) is also visible, but the pneumomediastinum is not present. b An axial CT image reveals a left lower lobe pneumatocele (black arrows), while the normal left IPL (black arrowhead) lies along the esophagus. A pneumothorax (white asterisk) is also visible. The pneumatocele and pneumothorax disappeared on the supine radiograph 3 months later