Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Midline sternotomy wires and mediastinal clips are again noted . The heart remains mildly enlarged . There is no evidence of edema or pneumonia . No large effusion or pneumothorax is seen . The imaged bony structures appear intact . There is no free air below the right hemidiaphragm .
    OUTPUT:
    
Mild cardiomegaly . Otherwise unremarkable .