Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is borderline enlarged . The aorta is tortuous , and prominence of the aortic knob may partially be due to the presence of an aberrant right subclavian artery . There is crowding of the bronchovascular structures due to low lung volumes without overt pulmonary edema . Patchy opacities are demonstrated in the lung bases , more pronounced on the right which appear somewhat linear in configuration . These likely reflect areas of atelectasis . No pleural effusion or pneumothorax is present . There are no acute osseous abnormalities . A common bile duct stent is partially imaged in the right upper quadrant of the abdomen .
    OUTPUT:
    
Bibasilar opacities most likely reflect atelectasis , particularly on the right which has a more linear configuration .