Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view of the chest shows interval reduction of lung volumes with new left lung base opacity , probably due to left lower lobe aspiration . Blunting of the left costophrenic angle is probably due to small pleural effusion . Right lung is otherwise clear . Heart size is still enlarged with stable mild vascular congestion .
    OUTPUT:
    
New left lung base opacity might be due to spiration . New small left pleural effusion and stable cardiomegaly and vascular congestion .