Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is increased retrocardiac opacification on the lateral radiograph corresponding to increased opacity of the left heart border concerning for left lower lobe pneumonia . A small left pleural effusion is present . No significant pneumothorax is detected . An air - filled esophagus is noted projecting along the right paratracheal stripe . The cardiomediastinal silhouette is unchanged allowing for decreased lung volumes from ___ .
    OUTPUT:
    
Increased retrocardiac and left heart opacity concerning for lower lobe pneumonia with probable left pleural effusion .