Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes significantly limit assessment . There is mild perihilar vascular prominence likely representing congestion . There is no definite focal consolidation , pleural effusion , or pneumothorax . There is an abnormally widened mediastinal contour , minimally changed from ___ . Evaluation of the cardiac silhouette is limited There is no free intraperitoneal air . Posterior spinal fusion hardware is noted overlying the lower thoracic and upper lumbar vertebral bodies . There is no fracture .
    OUTPUT:
    
As above . Please refer to subsequent CT chest for further details .