Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes remain low , particularly on the right however there is improved aeration of the right lung base with partial resolution of the airspace opacities . There is persistent prominence of the pulmonary vasculature . Right basilar atelectasis is unchanged . No pneumothorax or pleural effusion seen . The cardiomediastinal contour is unchanged .
    OUTPUT:
    
Given the rapid interval improvement in the right basal airspace opacity , this likely reflect asymmetric pulmonary edema although there is residual opacity in the right mid lung and superimposed infection can not be excluded .