Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate a normal cardiomediastinal silhouette and fairly well - aerated lungs . Linear opacities in the bilateral lung bases are compatible with atelectasis , as before . There is no definite focal consolidation or pleural effusion or pneumothorax . The visualized upper abdomen is unremarkable .
    OUTPUT:
    
Bibasilar atelectasis . No acute cardiopulmonary process .