Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest . The lungs are hyperinflated . The previously seen tree - in - ___ opacities on chest on the prior most recent chest CT in the lower lobes is still apparent on this study . There is no evidence of pulmonary edema , pleural effusion or pneumothorax . The cardiomediastinal and hilar contours are normal .
    OUTPUT:
    
Bibasilar airway and airspace process still present , difficult to compare in severity to prior CT . Etiologies are either allergic or infectious .