Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Slight increase in opacity over the inferior spine on the lateral view , not substantiated on the frontal view , felt to unlikely represent consolidation , possibly atelectasis . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
Subtle increase in opacity over the inferior spine on the lateral view , not substantiated on the frontal view , felt to unlikely represent consolidation , possibly atelectasis vs artifact .