Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Cardiomegaly is unchanged with a small left pleural effusion . A linear density in the left mid lung may represent a focus of atelectasis . There is retrocardiac opacity suggestive of left lower lobe pneumonia . The right lung is clear . Bony structures are intact .
    OUTPUT:
    
Small left pleural effusion with left lower lobe opacity concerning for pneumonia . Stable cardiomegaly .