Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are persistently low . The heart size remains mildly enlarged but unchanged . Mediastinal contour is similar . Bilateral hilar enlargement compatible with lymphadenopathy is again noted . Increased interstitial markings are noted diffusely , but more so within the upper lobes , and not substantially changed in the interval , likely reflective of patient 's known sarcoidosis with fibrotic changes . No focal consolidation , pleural effusion or pneumothorax is clearly evident . There may be mild pulmonary vascular congestion . No acute osseous abnormality is seen .
    OUTPUT:
    
Chronic interstitial lung disease and bilateral hilar lymphadenopathy compatible with underlying sarcoidosis with fibrotic changes . Mild pulmonary vascular engorgement . No new focal consolidation .