Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Redemonstrated is a small , left apical pneumothorax , minimally increased in size from the prior examination and likely secondary to increased inspiration . The cardiomediastinal silhouette is unchanged in appearance . Calcifications are noted within the aortic arch . The right hemidiaphragm is elevated and demonstrates sub - diaphragmatic lucency likely secondary to colonic interposition , stable from the prior exam . Bibasilar atelectasis is noted . The upper lungs are grossly clear .
    OUTPUT:
    
Stable , small left apical pneumothorax , minimally changed from the prior examination .