Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a widespread interstitial abnormality , potentially chronic , although no prior studies are available . There is no focal consolidation . There is no evidence of pulmonary edema . Patchy mid - to - upper lung atelectasis / scarring is noted bilaterally . The heart is mildly enlarged . The mediastinal contours are normal . Note is made of a calcified lymph node in the aortopulmonary window . There are no pleural effusions . No pneumothorax is seen .
    OUTPUT:
    
1 . Widespread but mild interstitial abnormality , uncertain chronicity , possibly mild vascular congestion , although potential more chronic ; in addition to patchy opacities suggesting scarring or atelectasis . 2 . Mild cardiomegaly . 3 . Calcified mediastinal lymph nodes , likely due to prior granulomatous exposure .