Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded and clear . Cardiomediastinal silhouette is unremarkable . There is no pneumothorax . There is a moderate left pleural effusion , which is better characterized on concurrent chest CT . Visualized osseous structures are unremarkable .
    OUTPUT:
    
Moderate left pleural effusion , better characterized on concurrent chest CT .