Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low with left greater than right atelectasis in the lung bases . Small to moderate left pleural effusion . Low lung volumes cause crowding of the bronchovascular markings . Mild cardiomegaly . No pneumothorax .
    OUTPUT:
    
Small to moderate left pleural effusion . Mild cardiomegaly . No edema .