Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bilateral lower lung reticulation is similar to somewhat increased compared to prior radiographs from ___ but new since ___ ___ . Central pulmonary arteries are again mildly prominent . The lungs are otherwise clear . The heart size is normal . The mediastinal contours are normal . There are no pleural effusions . No pneumothorax is seen .
    OUTPUT:
    
No acute cardiac or pulmonary findings . However , persistent pulmonary opacities in the lower lungs may indicate underlying interstitial disease , a possibility which could be considered clinically and with dedicated chest CT if needed , versus primarily scarring from a prior insult such as previous infection or effusion .