Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy with aortic valve replacement . A small right pleural effusion has decreased . The lungs are clear . The rounded contour of the right hilus is stable dating back to ___ , and may be due to vasculature . There is stable mild cardiomegaly . There is no pneumothorax .
    OUTPUT:
    
Decreased small right pleural effusion . Stable mild cardiomegaly . Clear lungs .