Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a small linear opacity at the left base , which likely represents atelectasis . The lungs are otherwise clear . There is no consolidation , edema , pleural effusion , or pneumothorax . The cardiomediastinal silhouette is normal .
    OUTPUT:
    
No acute cardiopulmonary process ; specifically , no evidence of pneumonia .