Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is no evidence of pneumonia . Focal area of bulla is seen in left upper lobe . The mediastinal and cardiac contours are normal . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
1 . There is no evidence of pneumonia . 2 . Localized left upper lobe bulla .