Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The ___ shunt is again demonstrated in unchanged position , terminating in the low SVC . Lung volumes are low . Heart size is accentuated as the result of low lung volumes , and appears borderline enlarged . Mediastinal contour is unremarkable given the presence of low lung volumes . There is crowding of the bronchovascular structures without overt pulmonary edema . Streaky opacities are noted in the lung bases most likely reflective of atelectasis . No large pleural effusion or pneumothorax is visualized .
    OUTPUT:
    
Low lung volumes with streaky bibasilar opacities , likely atelectasis .