Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Focal ill - definition of the left heart border is new . There is no pleural effusion or pneumothorax . The cardiac silhouette is normal in size and mediastinal contours are normal . The pulmonary vasculature is normal .
    OUTPUT:
    
Mild silhouetting of the left heart border , which could potentially represent an early lingular pneumonia .