Bronchial rupture is a rare injury associated with blunt chest trauma. Clinical severity varies from mild to disastrous. It is frequently life-threatening, particularly when the diagnosis is delayed. In this study, we report our experience regarding 4 patients with this kind of injury. Roentgenographic presentations included pneumothorax /hemothorax, pneumomediastinum, and deep cervical emphysema. Only one patient, however, demonstrated the classic radiologic sign of ‘a fallen lung’ on an erect chest x-ray. The diagnosis was overlooked during the initial phase of management in half of our patients. While the fallen lung sign is diagnostic of bronchial disruption, it has a low sensitivity for identifying bronchial injury. The most important clue for this diagnosis is a persistent pneumothorax following adequate tube drainage.