Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low leading to crowding of the bronchovascular structures . Streaky left retrocardiac airspace opacities are noted . There is blunting of the left costophrenic angle , which likely represents a combination of atelectasis and trace pleural effusion . Allowing for AP projection , the heart may be mildly enlarged .
    OUTPUT:
    
Mild cardiomegaly , probable trace left pleural effusion , and left retrocardiac airspace opacities which may reflect atelectasis although superimposed infection is not excluded . Additional considerations include asymmetric pulmonary edema .