Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the prior radiograph , there is persistent mild pulmonary vascular congestion . Moderate cardiomegaly is unchanged . Opacity in the left lower lobe may reflect pneumonia in the correct clinical setting . Median sternotomy wires are intact , and there is no change in the left - sided pacemaker lead positions . Anchors overlying the right humeral head are unchanged .
    OUTPUT:
    
Confluent left retrocardiac opacity which may reflect pneumonia in the appropriate clinical setting . .