Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided AICD device is re - demonstrated with leads terminating the regions of the coronary sinus and right ventricle . Heart remains severely enlarged , perhaps minimally decreased in size from the prior study . Mediastinal contour is unchanged . There is continued mild pulmonary edema , slightly improved in the interval . Left basilar opacification likely reflects a combination of a small pleural effusion with associated atelectasis , not substantially changed from the prior . No pneumothorax is demonstrated .
    OUTPUT:
    
Slight interval improvement in mild pulmonary edema . Continued opacification of the left lung base likely reflective of a combination of left basilar atelectasis and small left pleural effusion .