Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is diffuse increased interstitial - pattern bilaterally . There is no lobar consolidation . There is no pneumothorax or pleural effusion . The heart size is top normal .
    OUTPUT:
    
Diffuse interstitial opacity may represent mild pulmonary edema or chronic changes . Atypical pneumonia in the appropriate setting is not entirely excluded .