Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A frontal upright view of the chest was obtained portably . Low lung volumes result in bronchovascular crowding . There is mild pulmonary edema in the setting of moderate - severe cardiomegaly . Opacification in the retrocardiac area is probably due to effusion , atelectasis , or infection .
    OUTPUT:
    
1 . Cardiomegaly and mild pulmonary edema . 2 . Retrocardiac opacity may represent effusion , atelectasis or pneumonia .