Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views the chest provided demonstrate clear well expanded lungs without focal consolidation , large effusion or pneumothorax . There is a C - shaped calcification projecting over the heart , as on prior , compatible with mitral annular calcification . The heart is not enlarged . The mediastinal contour is normal . Bony structures are intact .
    OUTPUT:
    
No acute intrathoracic process .