Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and CABG . Mild to moderate enlargement of the cardiac silhouette is noted . Atherosclerotic calcifications are noted within the aortic knob . Mediastinal contour is otherwise unremarkable . There is mild pulmonary edema with small bilateral pleural effusions . Airspace opacities in the lung bases likely reflect compressive atelectasis . No pneumothorax is identified however the medial aspect of the lung apices is obscured by the patient 's neck and chin projecting over these regions .
    OUTPUT:
    
Mild to moderate cardiomegaly with mild pulmonary edema and small bilateral pleural effusions . Probable bibasilar compressive atelectasis .