Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Chain sutures are noted at the left lung apex and a left - sided chest tube is present . No well - defined pneumothorax is identified . The possibility of a tiny residual pneumothorax can not be entirely excluded . Again seen is patchy opacity at the left lung base , consistent with collapse and / or consolidation . Probable slight improvement in the more nodular opacities seen at the left base laterally . Probable small left effusion , unchanged . Minimal atelectasis at the right lung base again noted . No new focal opacity detected . The right lung and costophrenic angle is otherwise grossly clear . Mild gastric distention again noted .
    OUTPUT:
    
No obvious pneumothorax . Left - greater - than - right opacities again seen , with slight interval improvement at the left base .