Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Midline sternotomy wires are unchanged . The heart continues to be enlarged , likely due to the exaggerating effect of AP projection . The lungs demonstrate minimal retrocardiac opacity on the frontal view which likely corresponds to moderate pleural fluid and atelectasis better seen on prior CT . There is no pneumothorax .
    OUTPUT:
    
Minimal retrocardiac opacity , likely representing atelectasis , with a moderate pleural effusion .