Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There appears to be a mechanical thumb drive overlying the left mediastinum , perhaps within the patients ' shirt pocket . The heart size is normal . The mediastinal and hilar contours are unremarkable . The lung is well expanded and clear . There is no evidence of pneumothorax or a pleural effusion . The visualized osseous structures are unremarkable .
    OUTPUT:
    
No acute abnormalities suggestive of amiodarone toxicity identified .