Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . There is mild interstitial edema evidenced by peribronchovascular thickening and subtle Kerley B lines . No large pleural effusion is seen . No overt pulmonary alveolar edema . Heart size is top normal . Mediastinal contour is unremarkable , though aorta is slightly unfolded . No pneumothorax . Bony structures intact .
    OUTPUT:
    
Mild pulmonary interstitial edema .