Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Sternotomy wires and mediastinal clips are noted . There are coronary artery stents . Heart is mildly enlarged but unchanged . There is no evidence for pulmonary edema . Lung volumes are normal . There is no pleural effusion , pneumothorax or focal airspace consolidation worrisome for pneumonia . Mediastinal and hilar contours are unremarkable .
    OUTPUT:
    
Unchanged mild cardiomegaly without a superimposed acute thoracic process .