Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is moderate cardiomegaly , unchanged . Left pleural effusion is decreased in size , and linear opacities in the left lower lung are indicative of atelectasis , likely chronic . The right lung demonstrates mild atelectasis at the base . Sternal wires are intact .
    OUTPUT:
    
Smaller left pleural effusion compared to ___ , with unchanged heterogeneous opacity in the left lower lung , likely representing atelectasis .