Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size is normal . The mediastinal and hilar contours are normal . The pulmonary vascularity is normal . There is linear atelectasis within the left lung base . Remainder of the lungs are clear . No focal consolidation , pleural effusion or pneumothorax is present . No acute osseous abnormalities are seen .
    OUTPUT:
    
No radiographic evidence for pneumonia .