Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is some improved aeration on the right side with no evidence of pneumothorax . The left lung is unchanged in appearance from the prior study The tracheostomy tube and right - sided PICC line are unchanged . The cardiomediastinal silhouette and hilar contours are within normal limits . No overt pulmonary edema is seen .
    OUTPUT:
    
No evidence of pneumothorax .