Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy , mitral valve replacement , and left - sided pacer device with leads terminating in the right atrium and right ventricle . Epicardial leads are also noted projecting over the left ventricular border . Mild cardiomegaly is re - demonstrated . The aorta remains tortuous . Hilar contours are unremarkable . Pulmonary vasculature is not engorged . Elevation the right hemidiaphragm is chronic . Subsegmental atelectasis is noted in the lower lobes bilaterally . No focal consolidation , pleural effusion or pneumothorax is present . Mild degenerative changes are seen within the thoracic spine .
    OUTPUT:
    
No radiographic evidence for pneumonia .