Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patchy linear opacities at the right base most likely represent atelectasis . There is no definite focal consolidation or pleural effusion or pneumothorax . Cardiomediastinal silhouette is stable with dense calcifications at the thoracic aorta . There is a right chest wall pacemaker with leads terminating in the right atrium and right ventricle . A fracture of the left fourth posterior rib is likely not acute .
    OUTPUT:
    
Linear opacities at the right base are likely atelectasis . No definite aspiration or focal consolidation .