Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs demonstrate linear opacities in the lower lungs , likely representing atelectasis . No opacity convincing for pneumonia is seen . Cardiomediastinal and hilar contours are within normal limits . Pulmonary vasculature is normal . No evidence of pulmonary edema . Blunting of the left costophrenic angle appears to been present on prior study , may reflect pleural thickening . There is no large pleural effusion . No pneumothorax . There is no air under the right in diaphragm .
    OUTPUT:
    
Bibasilar atelectasis . Otherwise unremarkable .