Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . Faint linear atelectasis in the right lower lung noted . Otherwise the lungs are clear . No pleural effusion or pneumothorax is seen . The cardiomediastinal silhouette appears normal . Imaged osseous structures are intact .
    OUTPUT:
    
No acute intrathoracic process