Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mildly enlarged . Low lung volumes result in bronchovascular crowding . There is mild engorgement of the pulmonary vasculature as well as bilateral , basilar opacities consistent with atelectasis and possibly mild pulmonary edema . There is no pneumothorax or pleural effusion identified .
    OUTPUT:
    
Low lung volumes with bilateral , subtle opacities left greater than right consistent with atelectasis , pneumonia is less likely . Possible mild edema .