Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A moderate size right pneumothorax is demonstrated with mild atelectasis of the right lung . There is no substantial shift of midline structures to the left . Cardiac silhouette size is normal . Mediastinal and hilar contours are unremarkable . Lungs are hyperinflated , unchanged . No large pleural effusion is noted , though the left costophrenic angle is excluded from the field of view . No acute osseous abnormality is seen . Atherosclerotic calcifications are again noted in the regions of both subclavian arteries .
    OUTPUT:
    
Moderate size right pneumothorax .