Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable frontal chest radiograph again demonstrates low lung volumes with increased prominence of the cardiac silhouette and bronchovascular crowding . Vascular congestion is mildly improved . A right chest tube is unchanged in position , allowing for differences in patient positioning . There has been interval improvement of a right anterior pneumothorax . Left base opacity is unchanged , likely representing pulmonary contusion , although superimposed infection can not be excluded . Subcutaneous emphysema in the right chest wall is slightly increased . Prominence of the left hilum , which appears to be merely vessels on recent CT .
    OUTPUT:
    
1 . Interval improvement of a right anterior pneumothorax , although right chest wall subcutaneous emphysema is increased . 2 . Unchanged left base opacity , again likely representing pulmonary contusion , although superimposed infection can not be excluded .