Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison with chest radiographs from ___ , lung volumes remain low . Predominantly linear bibasilar opacities are unchanged and likely reflect atelectasis . There is no focal consolidation , effusion , or pneumothorax . There is no central vascular congestion or overt pulmonary edema . The cardiomediastinal silhouette is normal . Cholecystectomy clips are seen in the right upper quadrant . Surgical hardware from prior posterior fusion surgery in the cervical spine is noted .
    OUTPUT:
    
1 . No evidence of pneumonia . No central vascular congestion or overt pulmonary edema . 2 . Persistent probable bibasilar atelectasis .