Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Focal opacity seen in the left midlung laterally with fiducial markers compatible with known left upper lobe mass and is slightly more conspicuous on the current exam . The lung volumes are seen with secondary crowding of the bronchovascular markings . No new region of consolidation nor effusion . The cardiomediastinal silhouette is within normal limits . Atherosclerotic calcifications seen at the aortic arch . Chronic deformity of the right humeral head is noted .
    OUTPUT:
    
No definite acute cardiopulmonary process . Known left upper lobe mass with fiducial markers is slightly more conspicuous within limitation of differences in technique . CT would offer better detail if desired .