Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . The patient is status post median sternotomy and CABG . There is persistent slight blunting of the posterior left costophrenic angle which may be due to a small pleural effusion versus pleural thickening . The cardiac silhouette remains enlarged . The mediastinal contours are stable . There is mild - to - moderate pulmonary vascular congestion . No pneumothorax is seen . Evidence of DISH is seen along the spine .
    OUTPUT:
    
Possible small left pleural effusion . Persistently enlarged cardiac silhouette . Pulmonary vascular congestion .