Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . This accentuates the size of cardiac silhouette which is mildly enlarged . The aorta is slightly tortuous . Crowding of bronchovascular structures is present without overt pulmonary edema . Streaky and linear opacities in the lung bases likely reflect areas of atelectasis . No pleural effusion or pneumothorax is present . There are moderate degenerative changes noted in the lower thoracic spine .
    OUTPUT:
    
Low lung volumes with probable bibasilar atelectasis .