Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the study of ___ , small to moderate left pleural effusion with adjacent atelectasis is grossly unchanged . Left basilar opacity likely represents a combination of pleural fluid and atelectasis , but superimposed infection / consolidation is not excluded . No focal consolidation in the right lung . No change in the cardiomediastinal silhouettes . Calcification of the trachea is again noted .
    OUTPUT:
    
Persistent small to moderate left pleural effusion and atelectasis . Underlying consolidation / infection is not excluded in the correct clinical setting . Findings are similar to that of ___ .