Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since ___ , known left pneumothorax is decreased from 2 .6 cm to 1 .7 cm at the left lung apex . Known fibrotic lung disease with unchanged low lung volumes . Left chest tube is unchanged in placement . No evidence of tension . Heart size is normal .
    OUTPUT:
    
1 . Since earlier same day chest radiograph , known left pneumothorax is decreased from 2 .6 cm 1 .7 cm of the left long apex .