Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The hilar and mediastinal contours are normal . There is a tracheostomy tube in place approximately 4 .5 cm from the carina . A VP shunt catheter is seen overlying the left chest , overall unchanged compared to the prior exam from ___ . The lung volumes are low ; however , there appears to be a subtle increase in opacification at the lateral left lung base . Note is made of streaky band - like atelectasis in the lower right lung . There is no large pleural effusion or pneumothorax .
    OUTPUT:
    
Subtle increase in opacification over the lateral left lung base , likely secondary to overlapping structures , however mild consolidation secondary to effusion or aspiration / infection is not excluded .