This 23-year-old man was involved in a motor vehicle accident. What is the diagnosis?: (A) Aortic dissection, (B) Cardiac rupture, (C) Diaphragmatic rupture, (D) Pneumothorax
Answer is D. Answer D. PneumothoraxThe presence of a deep, lucent, right costophrenic angle on supine chest radiography is an indirect sign of a pneumothorax. In addition, a pneumothorax with associated rib fractures and subcutaneous emphysema is evident in the right chest. The patient's endotracheal tube needs to be withdrawn further into the trachea.