Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are hyperexpanded , an a left retrocardiac airspace opacity is identified . There are probable small bilateral pleural effusions . No pneumothorax or pulmonary edema . Mild cardiac enlargement is unchanged . Extensive calcifications are seen in the aortic arch .
    OUTPUT:
    
1 . Mild cardiomegaly and small bilateral pleural effusions . 2 . Left retrocardiac airspace opacity likely reflects atelectasis , although superimposed infection is difficult to exclude .