Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low compared to the previous study . This accentuates the size of the cardiac silhouette which appears moderately enlarged . The aorta remains tortuous . Crowding of bronchovascular structures is demonstrated without overt pulmonary edema . Patchy opacities within the lung bases likely reflect areas of atelectasis . Minimal blunting of the left costophrenic angle suggests a small left pleural effusion . No pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Low lung volumes with patchy opacities in the lung bases , possibly atelectasis . Small left pleural effusion .