Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is mildly enlarged . There is slight mediastinal widening , however , this is overall stable compared to the prior exam . There is a small linear density at the left lung base which is likely secondary to atelectasis . There are no pleural effusions . No pneumothoraces are seen . The visualized osseous structures are unremarkable . Incidental note is made of a hiatal hernia .
    OUTPUT:
    
No focal consolidation concerning for infection . No pulmonary edema . Atelectasis at the left lung base .