Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP upright portable view of the chest was obtained . There is elevation of the left hemidiaphragm , as also seen previously , with blunting of the left costophrenic angle , similar in appearance to the prior study from ___ . Mitral annulus calcification is seen . There is mild right base atelectasis . Subtle right base opacity most likely relates to atelectasis , although an early infectious process is not entirely excluded . The cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Mild right base opacity most likely relates to atelectasis , although an infectious process can not be excluded in the appropriate clinical setting . Stable elevation of the left hemidiaphragm and blunting of the left costophrenic angle with overlying atelectasis / scarring .