Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been improvement opacification at the left lung base , with residual linear atelectasis and partial left lower lobe collapse . The right lung is clear . Heart size is normal and there is a small left pleural effusion . Small amount of air adjacent to the left heart border maybe a small amount of pneumomediastinum . Pleural catheter marginates the mediastinum at the level of the AP window . No appreciable pneumothorax . .
    OUTPUT:
    
Improvement in the left lung base opacity , with persistent partial left lower lobe collapse . No appreciable left pneumothorax . Pleural catheter marginates the mediastinum . Attention on follow up .