Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette is moderately enlarged similar to prior examination with re-demonstration of a tortuous calcified thoracic aorta . Patient is status post CABG with median sternotomy wires in place . Hilar contours are unremarkable without evidence of overload or interstitial edema . A small left - sided effusion with associated compressive atelectasis is improved compared to prior examination . The remainder of the lung fields are clear . There is no pneumothorax .
    OUTPUT:
    
Improving small left pleural effusion with compressive atelectasis . No evidence of fluid overload or interstitial edema .