Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are fully expanded and clear . Probable trace left pleural effusion . No pneumothorax . . Heart size is normal . Cardiomediastinal and hilar silhouettes are normal . A radiopaque device projects over the left anterior chest wall .
    OUTPUT:
    
Probable trace left pleural effusion . In the absence of a known etiology , pulmonary embolism is a consideration . If clinical concern , recommend a D - dimer or chest CTA for further evaluation .