Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval removal of a left - sided chest tube . There is a small basal pneumothorax , which is seen on the lateral film only , with no evidence of tension . A right - sided atelectatic band at the right costodiaphragmatic angle is improved . The left basal atelectasis remains stable . The cardiomediastinal and hilar contours are normal .
    OUTPUT:
    
Small basilar pneumothorax without evidence of tension .