Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Hyperinflation of the lungs likely reflects underlying emphysema . Mild basal atelectasis . No convincing evidence of pneumonia or edema . No pneumothorax or pleural effusion . The cardiomediastinal and hilar contours are within normal limits and stable . The aorta is tortuous and calcified as before . No rib fractures are identified however chest radiographs are not sensitive for the detection of nondisplaced rib fractures .
    OUTPUT:
    
Subtle bibasilar opacities likely reflect atelectasis . No rib fractures .