Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest provided . Lung volumes are low . Allowing for low lung volumes , there is no convincing evidence for pneumonia or edema . There is mild left basal atelectasis noted . No large effusion or pneumothorax . Cardiomediastinal silhouette is normal . Imaged osseous structures are intact . No free air below the right hemidiaphragm is seen .
    OUTPUT:
    
No acute intrathoracic process .