Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is silhouetting of the right hemi diaphragm , which is new since ___ , and may represent a right lower lobe pneumonia . Mild interstitial edema , which is also new . Mild enlargement of the right atrial silhouette in comparison to ___ . The mediastinal and hilar contours are normal . No pneumothorax is seen .
    OUTPUT:
    
1 . Silhouetting of right hemidiaphragm , which may represent a right lower lobe pneumonia or pulmonary edema . 2 . Mild enlargement of the right atrium in comparison to ___ .