Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Diffuse basilar predominant reticular opacities are of uncertain etiology and could reflect chronic interstitial lung disease , pulmonary edema , or atypical infection . Comparison with prior imaging would be helpful for further assessment . Edema seems less likely given the lack of hilar and cardiac enlargement . Biapical opacities with elevation of the bilateral hila , left greater than right , suggests scarring related to prior infection , possibly tuberculosis . There is no pneumothorax . The heart size is at the upper limits of normal . There is no pneumothorax . Healed right lower rib fractures are noted ; no acute fracture is evident on this chest examination .
    OUTPUT:
    
1 . Basilar interstitial opacities of uncertain etiology , though likely atypical infection or chronic interstitial lung disease . Correlation with prior imaging would be helpful . 2 . Biapical scarring , left greater than right , possibly due to prior tuberculosis exposure . 3 . Heart size at the upper limits of normal . 4 . No pneumothorax or acute fracture .