Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is enlarged but likely exaggerated related to lower lung volumes . Pulmonary vascular congestion is unchanged . The left hemidiaphragm is obscured secondary to a small left pleural effusion and increasing adjacent atelectasis though given patient 's current symptoms a superimposed pneumonia can not be excluded . No pulmonary edema or pneumothorax are seen .
    OUTPUT:
    
Small left pleural effusion and adjacent atelectasis though superimposed left lower lobe pneumonia can not be excluded .