Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . The lungs are clear of focal consolidation or effusion . No pneumothorax . Increased interstitial markings seen throughout the lungs are unchanged when compared to ___ . Cardiac silhouette is unchanged . Hilar contours are also stable dating back to ___ . No acute osseous abnormality identified .
    OUTPUT:
    
Chronic increased interstitial markings without superimposed acute cardiopulmonary process . No pneumothorax .