Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest demonstrate well expanded lungs . There is obscuration of the left border , which may represent early lingular pneumonia , and is not definitely seen on the lateral view . The cardiomediastinal and hilar contours are unremarkable . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Obscuration of the left heart border which may represent early lingular pneumonia , and is not definitely seen on the lateral chest x-ray .