Radiology A patient of RTA with injury over chest and limbs has low SP02. M-mode ultrasound of right upper chest shows stratosphere sign. What is the diagnosis? A Hemothorax B Pneumothorax C Cardiac tamponade D Pulmonary embolism 💡 Explanation A patient of RTA with injury over chest and limbs has low SP02. M-mode ultrasound of right upper chest shows stratosphere sign. What is the diagnosis? ✓ Correct Answer: B. Pneumothorax