Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a left upper lobe ill - defined heterogeneous opacification . The lungs are otherwise clear and hyperinflated . The hila and pulmonary vasculatures are normal . No pleural abnormalities or pneumothorax . The cardiomediastinal silhouette is normal . No fractures .
    OUTPUT:
    
Left upper lobe pneumonia .