Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the prior radiograph , no significant change in bilateral increased interstitial lung markings , basal predominant , consistent with fibrosis / chronic lung disease . There is persistent blunting of the right costophrenic angle without large pleural effusion or pneumothorax . Cardiomediastinal silhouettes are unchanged . Slight increase in right basilar opacity may be due to overlying minimal edema or acute exacerbation on chronic disease .
    OUTPUT:
    
Chronic interstitial lung disease , indicated by prominent basal predominant interstitial lung markings and fibrosis . Increased opacity at the right lung base may be due to acute exacerbation of the chronic process . Superimposed infection is not excluded . No evidence of pneumothorax .