Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest were obtained . Midline sternotomy wires and mediastinal clips are again noted . There is no definite sign of pneumonia . Heart size is top normal . There is no overt pulmonary edema though central congestion is difficult to exclude . No pleural effusion or pneumothorax . Bony structures are intact .
    OUTPUT:
    
No signs of pneumonia . Possible mild congestion .