Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The cardiomediastinal silhouette and pulmonary vasculature are unremarkable . There is linear bibasilar atelectasis with otherwise clear lungs . No definite consolidation is identified . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Bibasilar atelectasis . No definite pneumonia . .