Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a new focal opacity at the left lung base confirmed with a spine sign on the lateral view worrisome for infection . Elsewhere , the lungs are clear . The cardiomediastinal silhouette is within normal limits . Vascular stents noted at the thoracic inlet on the right as well as a tracheostomy tube which is in stable position . Surgical clips project over the right chest wall . No acute osseous abnormalities identified .
    OUTPUT:
    
Left lower lobe opacity worrisome for infection or potentially aspiration . Followup after treatment is suggested to document resolution .