Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An approximately 6 mm diameter rounded opacity is again demonstrated in the left retrocardiac region , to the left of the descending aortic interface . It overlies the tenth left posterior rib level and is not definitively calcified but overlap with rib limits this assessment . Lungs are otherwise notable for surgical chain sutures in right mid lung . Cardiomediastinal contours are within normal limits . Left subclavian and brachiocephalic vascular stents remain in place . Minimal pleural thickening versus small effusion at lateral right costophrenic sulcus . No acute skeletal findings .
    OUTPUT:
    
6 mm diameter left lower lobe opacity is unchanged since recent chest radiograph , but is not fully characterized . Considering patient 's immunosuppressed status and concern for acute infection , CT may be considered for more complete evaluation of this region if warranted clinically . This was discussed by telephone with the physician covering for Dr . ___ at pager ___ on ___ at 11 :50 a .m .