Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . The lungs are grossly clear aside from mild left basilar atelectasis . No large effusion or pneumothorax is seen . Cardiomediastinal silhouette appears grossly unremarkable . No acute bony abnormalities are seen .
    OUTPUT:
    
No acute intrathoracic process