Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Aeration at the right base continues to improve , but there are still residual airspace opacities containing air bronchograms . However , a retrocardiac airspace opacity at the left base has increased . There is stable mediastinum can not be accurately assessed on this projection . Biapical thickening is unchanged . There is no pneumothorax . A small right pleural effusion is stable .
    OUTPUT:
    
Resolving right basilar aspiration or infection with a stable small right pleural effusion . Worsening left lower lobe aspiration or infection .