Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal contours are unchanged . Cardiac size is normal . Patient has known large hiatal hernia . Bibasilar atelectasis have markedly improved . Bilateral effusions are small . There is no pneumothorax . The upper lungs are clear . Sternal wires are aligned . Patient is status post AVR
    OUTPUT:
    
Small bilateral effusions . Marked improved bibasilar atelectasis .