Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are present . Heart size is mildly enlarged . Atherosclerotic calcifications are noted at the aortic knob . Widening of the mediastinal contour is likely due to low lung volumes . There is crowding of bronchovascular structures without overt pulmonary edema . Small right pleural effusion is likely present along with patchy opacities in the lung bases , most likely due to atelectasis . No pneumothorax is present . No acute osseous abnormality is detected .
    OUTPUT:
    
Low lung volumes with probable bibasilar atelectasis . Small right pleural effusion .