Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is mildly enlarged . Widening of the superior mediastinum is likely due to low lung volumes . Hilar contours are grossly unremarkable . There is mild pulmonary vascular congestion . Patchy opacities in the lung bases likely reflect atelectasis with more confluent in the left lung base concerning for superimposed infection or aspiration . No large pleural effusion or pneumothorax is identified . Several chronic appearing left - sided rib deformities are noted .
    OUTPUT:
    
Low lung volumes . Probable bibasilar atelectasis with more focal opacity in the left lung base concerning for infection or aspiration . Mild pulmonary vascular congestion .