Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Indwelling support and monitoring devices are in standard position , and cardiomediastinal contours are stable in appearance compared to the prior study . Lung volumes are slightly increased compared to the prior exam , and there has been improved aeration at both lung bases . Residual opacities persist in the retrocardiac areas and probably represent atelectasis . There are also small pleural effusions , left greater than right .
    OUTPUT:
    
Improving aeration at lung bases with residual retrocardiac opacities . Small pleural effusions , left greater than right .