Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable AP view of the chest demonstrates diffuse reticular and nodular opacities , not significantly changed since the prior study , and in keeping with a fibrotic chronic interstitial lung disease . There is evidence of linear atelectasis within the right mid lung , as well as bibasilar atelectasis . A small area of patchy opacification within the right lower lung , along the right hemidiaphragm , could represent atelectasis or pulmonary fibrosis alone , however a superimposed infectious process can not be completely excluded . No pneumothorax or large pleural effusion is identified . Known hiatal hernia is not as well appreciated on this study .
    OUTPUT:
    
Patchy opacity in the right lower lung , could represent superimposed infection in the setting of fibrotic chronic interstitial lung disease .