Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided pacemaker with leads in appropriate position . Sternotomy wires are intact . The enteric tube ends in the stomach . Partially visualized VP shunt is seen . Retrocardiac opacity representing left lower lobe collapse is increased . No pleural effusion or pneumothorax .
    OUTPUT:
    
Retrocardiac opacity consistent with left lower lobe collapse has increased .