Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . There is mild bibasilar atelectasis . New since the prior study , best seen on the lateral view , there is undulating prominence of the pleura , probably on the left , which could be due to a loculated pleural effusion , however , pleural thickening due to other entities such as neoplasm is not excluded . The patient is status post median sternotomy and CABG . The cardiac silhouette is top normal - to - mildly enlarged . The aorta is calcified . No pneumothorax is seen .
    OUTPUT:
    
Best seen on the lateral view , there is thickening along the posterior pleura , more likely on the left side ; differential diagnosis includes loculated pleural effusion versus soft tissue . Also , correlate with history of procedure at this site in the interval since the prior study from ___ , finding is new since that time .