Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear without confluent opacity , pleural effusion or pneumothorax . The cardiac and mediastinal contours are normal . A metallic density projecting over the left hemidiaphragm is likely in the subcutaneous tissues or external to the patient . There is no free air beneath the right hemidiaphragm .
    OUTPUT:
    
No acute intrathoracic process .