Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild diffuse interstitial opacities could represent crack lung . Left basal curvilinear opacity could be due to infection . No pulmonary vascular congestion or edema . There is moderate bibasilar atelectasis . There is no effusion or pneumothorax . The cardiomediastinal silhouette is normal . Imaged osseous structures are intact . No free air below the right hemidiaphragm is seen .
    OUTPUT:
    
1 . Mild diffuse interstitial opacities could represent crack lung . 2 . Left basal curvilinear opacity could be due to infection .