Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is abnormal opacity with lack of clear delineation of the right cardiac margin and as well as curvilinear lucency in the same region . Heart is likely enlarged . Dense mitral annular calcifications are noted . Superiorly the lungs are clear . Atherosclerotic calcifications noted in the thoracic aorta .
    OUTPUT:
    
Mixed lucency and density in the region of the right cardiac margin likely due to a hiatal hernia .