Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Opacity in the right base is linear , and likely the result of atelectasis . The cardiac silhouette is moderately enlarged . There is mild interstitial pulmonary edema . The mediastinal contours are unchanged with calcification noted of the aortic knob . There is no pneumothorax . Abdominal surgical clips are unchanged .
    OUTPUT:
    
Unchanged moderate cardiomegaly with mild interstitial edema and basilar atelectasis .