Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient status post median sternotomy and CABG . Heart size is mildly enlarged . The mediastinal and hilar contours are unremarkable . The pulmonary vasculature is not engorged . Small bilateral pleural effusions , left greater than right are present , with the left - sided pleural effusion slightly larger compared to the prior exam . Left basilar opacity may reflect atelectasis or pneumonia in the correct clinical setting . No pneumothorax is seen . No acute osseous abnormalities seen .
    OUTPUT:
    
Bilateral small pleural effusions , left greater than right , with interval increase in size of the left pleural effusion . Left basilar opacity may reflect atelectasis but pneumonia is not excluded in the correct clinical setting .