Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . Heart size remains moderately enlarged . Mediastinal and hilar contours are relatively unchanged . A moderate to large left pleural effusion appears minimally increased in size compared to the prior study . Compressive atelectasis is noted in the left lung base . Trace right pleural effusion is also demonstrated , unchanged . No pulmonary edema or pneumothorax is present . There are moderate multilevel degenerative changes seen in the thoracic spine .
    OUTPUT:
    
Slightly increased size of moderate to large left pleural effusion and unchanged trace right pleural effusion . Left basilar compressive atelectasis .