Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest were acquired . The lungs are clear . There is a 5 mm ovoid dense opacity projecting over the left retrocardiac region , likely a calcified granuloma . The heart is normal in size . The mediastinal contours are normal . There are no pleural effusions . No pneumothorax is seen . No displaced rib fractures are seen .
    OUTPUT:
    
No acute cardiac or pulmonary findings .