Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A moderate left and small right pleural effusion are grossly unchanged . Cardiomediastinal silhouette is overall unchanged . There is a background of mild pulmonary edema , similar to prior . There is no pneumothorax .
    OUTPUT:
    
Moderate left and small right pleural effusions . Background pulmonary edema , similar to prior .