Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are present . This accentuates the size of the cardiac silhouette which is moderately enlarged . The aorta is unfolded . Widening of the superior mediastinum is likely attributable to low lung volumes . Hazy opacification in the retrocardiac region likely reflects atelectasis . No pneumothorax is seen . There is no definite pulmonary edema . Small left pleural effusion may be present . There is no acute osseous abnormality .
    OUTPUT:
    
Low lung volumes with left basilar opacity likely reflecting atelectasis . Infection is not completely excluded . Small left pleural effusion is not excluded .