Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are present which results in crowding of bronchovascular structures , but no overt pulmonary edema . Blunting of the left costophrenic angle suggests a trace left pleural effusion with associated left basilar atelectasis . Heart size is normal . The mediastinal and hilar contours are normal . No pneumothorax . There are no acute osseous abnormalities .
    OUTPUT:
    
1 . Patchy left basilar opacity , likely atelectasis with probable trace left pleural effusion . 2 . No pulmonary edema .