Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . There is diffuse increase in interstitial markings , as also noted on prior studies , although there appears to be slightly increased prominence in the upper lobes as compared to the prior study , although similar as compared to ___ . It is noted that at that time , atypical superimposed infection could not be excluded . The cardiac and mediastinal silhouettes are unremarkable . Hilar contours are stable . No pleural effusion or pneumothorax is seen .
    OUTPUT:
    
Increased interstitial markings bilaterally in this patient with known chronic lung disease ; however , appear more prominent as compared to the prior study from ___ , although similar compared to ___ ; chronic lung disease , superimposed infectious process difficult to exclude , although no lobar pneumonia seen .