Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with ___ at 11 :29 and allowing for differences in positioning and technique , I doubt significant interval change . Again seen is prominent retrocardiac opacity , with a single surgical clip overlying the cardiac silhouette . As before , the possibility of a left - sided effusion can not be excluded . Also again seen is upper zone redistribution an atelectasis in the right cardiophrenic region , in the setting of low inspiratory volumes . Allowing for this , the right lung is otherwise grossly clear . No pneumothorax is detected in the setting of lordotic positioning . Prominent lucency is seen in the left upper quadrant of the abdomen , but could represent gas within the stomach .
    OUTPUT:
    
1 . Doubt significant interval change compared with earlier the same day . 2 . Increased retrocardiac opacity again noted , similar to the prior study . 3 . No new focal opacity identified . Doubt significant CHF .