Bronchial rupture in blunt trauma is caused by sudden compression of the chest with dislocation of the lungs. The less pliant bronchi may thus rupture. Bronchial rupture is rare in patients admitted alive. Bronchial rupture has been diagnosed in two of the last 275 severe chest traumas admitted to Ullevål hospital since 1993 (0.7%). A 19-year-old male had total atelectasis of the lung 19 days after the trauma. A four-year-old boy experienced total collapse of the lung and became critically ill the fourth day after initial normalisation of the chest X-ray. Both patients were successfully operated on, with reconstruction of the left main bronchus in both cases, after 29 and seven days, respectively. In the child an upper lobectomy was necessary. These patients illustrate that with expectative treatment in bronchial rupture, serious complications may be experienced.