Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable supine view of the chest . Vagal stimulator again noted projecting over the left chest . Lung volumes are low though allowing for this the lungs appear clear . Faint linear densities in the left lung base are unchanged from prior , likely representing scarring or atelectasis . No supine evidence for effusion or pneumothorax . The cardiomediastinal silhouette appears stable . No acute osseous abnormality .
    OUTPUT:
    
No acute intrathoracic process