Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low , with mild bibasilar atelectasis . No focal consolidation is present . The hilar and cardiomediastinal contours are normal . There is no pneumothorax or pleural effusion . The pulmonary vascularity is normal . Patient is status post left mastectomy .
    OUTPUT:
    
Mild bibasilar atelectasis in the setting of low lung volumes . No definite evidence for pneumonia .