Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are unchanged with architectural distortion , superior bilateral hilar retraction , traction bronchiectasis , nodularity and fibrosis involving both upper lobes . No new focal consolidation , pleural effusion or pneumothorax is present . No pulmonary edema is detected , though there may be mild pulmonary vascular congestion . No acute osseous abnormality is visualized .
    OUTPUT:
    
Perhaps mild pulmonary vascular congestion . Otherwise , chronic changes in the upper lobes which may be due to sarcoidosis or chronic granulomatous disease .