Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged with a left ventricular predominance . The aorta remains tortuous . Low lung volumes cause crowding of the bronchovascular structures without overt pulmonary edema . Streaky opacities in the lung bases likely reflect atelectasis , but no focal consolidation is present . There is no pleural effusion or pneumothorax . No acute osseous abnormalities demonstrated .
    OUTPUT:
    
Mild bibasilar atelectasis .