Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Dual chamber pacemaker is in left pectoral region with lead tips in the right atrium and right ventricle . Sternotomy wires are in correct position . Clear lungs bilaterally without pleural effusion or pneumothorax . Likely borderline enlargement of left atrium and left ventricle is unchanged with normal heart size , mediastinal contour , and hila . No bony abnormality .
    OUTPUT:
    
Likely borderline enlargement of left atrium and left ventricle is unchanged . No radiographic evidence of pneumonia . Unable to contact Dr .___ ___ office . Results emailed on ___ by Dr .___ at ___ within 20 minutes .