Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest demonstrates vascular congestion and cardiomegaly . An opacity at the left lung base may represent atelectasis , however , pneumonia should not be excluded in the appropriate clinical setting . Aortic arch calcifications , sternotomy wires and CABG ___ are noted .
    OUTPUT:
    
Mild pulmonary edema . Left base opacity may be atelectasis , however , pneumonia should be excluded in the appropriate clinical setting . Post - diuresis films would be of utility in excluding underlying infection .