Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Support Devices : None . There is a new heterogeneous opacity in the left lower lobe compared to the prior study . The lungs are otherwise clear . The hilar and cardiomediastinal contours are normal . There is no pneumothorax or pleural effusion . Pulmonary vascularity is normal .
    OUTPUT:
    
Findings concerning for left lower lobe pneumonia .