Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable AP radiograph was provided . There is increased opacity at the right base which may be due to infectious process or aspiration . Rounded density projecting over the right ninth posterior rib is likely a nipple shadow and can be followed on subsequent radiographs . A chronic moderate - sized left pleural effusion is similar in appearance to the prior study . Overlying opacities are likely atelectasis . Cardiomediastinal silhouette is unchanged . Median sternotomy wires are intact .
    OUTPUT:
    
New opacity at the right base may represent infection or aspiration . Stable moderate left pleural effusion with overlying atelectasis .