Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes remain low . Heart size is moderately enlarged , accentuated by the presence of low lung volumes . The aorta remains tortuous and calcified at the arch . Mediastinal contours appear relatively unchanged . There is crowding of bronchovascular structures with possible mild pulmonary vascular engorgement . Mild streaky opacities in the lung bases are likely reflective of atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . Vascular stent projecting over the right apex is unchanged . There are no acute osseous abnormalities .
    OUTPUT:
    
Low lung volumes with possible mild pulmonary vascular congestion and bibasilar atelectasis .