Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: When compared to previous same - day chest x-ray there has been mild interval improvement to the fluid accumulation in the posterior left costal pleural space . Moderate left pleural effusion and left basilar atelectasis are unchanged . The right lung is clear . Positioning of the right PICC line is unchanged .
    OUTPUT:
    
Mild interval improvement of posterior left costal pleural space fluid accumulation with unchanged moderate left pleural effusion and moderate left basilar atelectasis .