Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable upright frontal chest radiograph demonstrates low lung volumes resulting in exaggeration of the cardiac silhouette and bronchovascular crowding . Allowing for this , the heart is likely top normal in size . There is no appreciable pulmonary edema , effusion , or pneumothorax . Indistinctness of the right heart border raises concern for right middle lobe pneumonia . There is left lower lung atelectasis .
    OUTPUT:
    
1 . Indistinct right heart border , concerning for right middle lobe pneumonia . 2 . Low lung volumes without appreciable pulmonary edema . Left lower lung atelectasis .