Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: No prior for comparison . Subtle increased interstitial markings bilaterally may be due to minimal interstitial edema or related to chronic lung disease . No lobar consolidation is seen . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are unremarkable . Aortic knob calcification is seen .
    OUTPUT:
    
Subtle increased interstitial markings bilaterally may be due to minimal interstitial edema versus chronic lung disease .