Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single frontal radiograph of the chest was acquired . There are heterogeneous opacities at both lung bases , left greater than right , possibly due to atelectasis , although an infectious process is possible . Interstial opacification suggests mild pulmonary vascular congestion . The heart size is top normal , as before . There are no definite pleural effusions . No pneumothorax is seen .
    OUTPUT:
    
1 . Bibasilar heterogeneous opacities , left greater than right , possibly atelectasis , although infection is not excluded . Clinical correlation recommended . 2 . Findings suggesting mild pulmonary vascular congestion .