This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: JIPMER 2017, Subject name: Radiology
[{'content': 'A 30 - year - old male chronic smoker presents with progressive breathlessness for 1 month. Chest x - ray is shown. What is the most probable diagnosis? \nSelect and explain. \nA. Vanishing lung syndrome, B. Pneumothorax, C. Panacinar emphysema, D. Collapse', 'role': 'user'}, {'content': 'Answer: A \nExplanation: * The given chest X-ray shows a bulla occupying 1/3rd of the hemithorax.it is characteristic of Idiopathic giant bullous emphysema which is also known "Vanishing Lung syndrome". It is common in young male and in smokers. It usually bilateral, asymmetrical and commonly involves the upper lobes of the lungs. * In pneumothorax, the lung will be collapsed towards the hilum and visceral pleural reflection is seen.* Visceral pleural reflection helps us to differentiate between pneumothorax and vanishing lung syndrome.', 'role': 'assistant'}]