Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal . The mediastinal contour is unremarkable . A small left pleural effusion is seen with adjacent significant left lower lung atelectasis that projects over the cardiac silhouette . Though no focal consolidations are seen a superimposed pneumonia can not be excluded .
    OUTPUT:
    
No direct evidence of pneumonia but given findings of a small left pleural effusion and adjacent severe atelectasis of the left lower lung a superimposed pneumonia can not be excluded .