Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs were obtained . Increased opacity is present in the left lower lobe with a small left pleural effusion . The right lung is fully expanded and clear . The cardiomediastinal silhouette , hilar contours , and pleural surfaces are normal . There is no pneumothorax .
    OUTPUT:
    
1 . Left lower lobe opacity which may be due to atelectasis but a supervening pneumonia must be considered in the appropriate clinical setting . 2 . Small left pleural effusion .