Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiograph demonstrates clear lungs bilaterally . Streaky opacity at the left lung base is most consistent with atelectasis . Cardiomediastinal and hilar contours are within normal limits . There is no large pleural effusion . There is no pneumothorax or evidence of pulmonary edema . Imaged osseous structures and upper abdomen are without an acute abnormality .
    OUTPUT:
    
No evidence of pneumonia .