Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a persistent opacity at the left base , although slightly improved from the prior exam , continues to be concerning for infection . There is no new opacity . There is no evidence of pulmonary edema , pleural effusion , or pneumothorax . The cardiomediastinal silhouette is normal . The osseous structures are unremarkable .
    OUTPUT:
    
Persistent left lower lobe opacity concerning for continued infection , although somewhat improved since the prior exam . Results were discussed with Dr . ___ at 13 :57 on ___ via telephone by Dr . ___ at the time the findings were discovered .