Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bibasilar opacities are improving with some residual opacity in the right lower lobe , but no new focal opacities are detected . Moderate cardiomegaly is unchanged . Pulmonary vascular congestion is improved without frank pulmonary edema . The mediastinal and contours are normal . Small right pleural effusion may be present but is unchanged . There is no pneumothorax .
    OUTPUT:
    
Interval improvement in bibasilar opacities with some residual in the right lower lobe , possibly small pleural effusion or residual pneumonia .