Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low , with heterogenous opacities in both lower lobes . Heart size is normal . There is probable central mild venous congestion and small bilateral pleural effusions . There is no pneumothorax .
    OUTPUT:
    
1 . Mild pulmonary edema . 2 . Bibasilar opacities may represent atelectasis or aspiration .