Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are present . The lungs and pleural spaces are grossly clear without pneumothorax or pleural effusions . Bibasilar atelectasis is present . Heart size is normal , and mediastinal contours are grossly unchanged . There is an old left clavicular deformity present .
    OUTPUT:
    
No acute intrathoracic process .