Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest . The left portion of the chest is not visualized . A small right pneumothorax is seen , decreased compared to prior study . Heart size is normal . No evidence of pneumonia . No pleural effusion is seen . Sternotomy wires are seen .
    OUTPUT:
    
Small right pneumothorax , decreased compared to prior study . No evidence of pneumonia .