Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A 2 mm calcified granuloma overlying the right upper lobe is again seen . The heart size is normal . Patient is post CABG with intact median sternotomy wires . Compared to the prior study , a new opacity in the retro left lower lobe could be due to atelectasis , or pneumonia in the correct clinical setting . No pneumothorax .
    OUTPUT:
    
New left lower lobe / retrocardiac opacity could be due to atelectasis , or pneumonia in the correct clinical setting . No pneumothorax .