Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable chest radiograph was provided . There are patchy bibasilar opacities which may represent a aspiration or atelectasis , infection not excluded . There is no pleural effusion or pneumothorax . The aorta is tortuous . The cardiac silhouette is top normal . An old rib fracture is present in a right sixth posterior rib .
    OUTPUT:
    
Bibasilar opacities may represent atelectasis or aspiration . Infection can not be excluded .