Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Allowing for differences in patient positioning , heart size and mediastinal contours are unchanged . Previously seen pulmonary edema has improved at the right lung base , but there is persistent left infrahilar opacity slightly worsened in the interval which may represent a combination of edema , atelectasis , and / or superimposed consolidation . No evidence of pleural effusion or pneumothorax . The remainder of the lungs are clear . Osseous structures appear unchanged .
    OUTPUT:
    
Improved right - sided pulmonary edema , but increased left infrahilar opacity which could reflect atelectasis , asymmetric edema , and / or superimposed consolidation / aspiration .