Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest are compared to previous exam from ___ . Since prior , there has been partial resolution of the left basilar opacity which still partially persists and could be due to atelectasis or scarring . Underlying infection is also possible . There is no visualized pneumothorax . The lungs are otherwise clear . The cardiomediastinal silhouette is within normal limits . No displaced rib fracture is identified .
    OUTPUT:
    
Partial resolution of previously identified left basilar opacity compatible with resolving effusion with some persistent linear opacities suggestive of scar versus atelectasis , infection not completely excluded . No pneumothorax .