Page 43 - Demo

Question 17: PneumothoraxOn a supine chest X-ray, which of the following signs is most specific for pneumothorax?%u2022 Deep sulcus sign%u2022 Lucent hemithorax%u2022 Flattened diaphragm%u2022 Shift of mediastinum%u2022 Enlarged cardiac silhouetteAnswer: Deep sulcus signExplanation: The deep sulcus sign, where air in the pleural space collects in the costophrenic angle creating a deep, lucent sulcus, is highly specific for pneumothorax on supine chest X-rays. This is particularly useful as pneumothorax can be difficult to detect on supine films.