Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are noted . Right basilar opacity is likely secondary to atelectasis . Elsewhere , the lungs are clear . There is no large effusion or vascular congestion . The cardiomediastinal silhouette is within normal limits . A linear radiopaque density with tip overlying the cervical spinal canal may be a spinal stimulator electrode . No acute osseous abnormalities identified .
    OUTPUT:
    
Probable right basilar atelectasis . Otherwise no evidence of acute cardiopulmonary process .