Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left pacemaker generator is contiguous with leads terminating in the right atrium and right ventricle . The patient is status post median sternotomy and TAVR with a core valve noted . Mitral calcifications are heavy . Osseous structures are unremarkable . The heart size is normal .
    OUTPUT:
    
1 . Lung fields are clear . 2 . Mitral calcifications are heavy .