Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A new left subclavian central venous catheter tip terminates in the upper SVC . Lung volumes are slightly low , but improved compared to the prior study . The heart size is likely mildly enlarged . The mediastinal and hilar contours are unremarkable . There is crowding of the bronchovascular structures likely due to low lung volumes , with cephalization and pulmonary vascular engorgement . No focal consolidation , pleural effusion or pneumothorax is identified . Multiple old left - sided rib fractures are again noted .
    OUTPUT:
    
Low lung volumes . Mild pulmonary vascular congestion .