Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Significant right middle lobe and right lower lobe collapse has slightly increased since the previous exam . There is probable small left pleural effusion . Left lower lobe mild atelectasis has slightly increased . There is no pulmonary edema . Prior sternotomy was done for CABG . There is no pneumothorax . Moderate mediastinal enlargement is stable .
    OUTPUT:
    
Significant right middle and right lower lobe collapse has slightly increased since previous exam .