Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal silhouette including cardiomegaly is stable . Sternotomy wires and mediastinal clips are unchanged in position . Lung volumes remain low . Bibasilar atelectasis has improved . There is no focal consolidation . Mild blunting of the posterior sulcus on the lateral view may represent atelectasis or a trace effusion . No pneumothorax .
    OUTPUT:
    
No evidence of pneumonia .