Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: No focal consolidation is seen . There may be subtle perihilar peribronchial thickening which is less conspicuous as compared to the prior study . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
No focal consolidation . Possible subtle mild perihilar peribronchial thickening , left severe as compared the prior study , could be due to viral or small airways disease .