Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is an oblong approximately 5 .5 cm radiopaque device overlying the left heart , of uncertain significance , possibly extracorporeal . The cardiomediastinal silhouette is stable and within normal limits . Mild aortic arch calcifications are noted . Aside from calcified left hilar lymph nodes , the hila are unremarkable . The lungs are clear without focal consolidation . There is no pulmonary edema . There is no pneumothorax . Minimal blunting of the bilateral lateral CP angles may represent trace pleural effusions .
    OUTPUT:
    
1 . Equivocal trace bilateral pleural effusions . Otherwise , no acute cardiopulmonary process . Unchanged calcified left hilar lymph nodes . 2 . oblong approximately 5 .5 cm radiopaque device overlying the left heart , of uncertain significance , likely extracorporeal . Correlate with physical exam .