Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiograph demonstrates clear lungs bilaterally . There is no pleural effusion . No evidence of pneumothorax . Cardiomediastinal and hilar contours are within normal limits . There is a metallic bullet shaped 7 x 10 mm density projecting posterior to the heart consistent with history of pericardial bullet fragment . No acute osseous abnormality is identified .
    OUTPUT:
    
No acute intrathoracic abnormality . Bullet fragment projecting posterior to the heart .