Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . Mediastinal and hilar contours are normal . Pulmonary vasculature is not engorged . Patchy opacity is demonstrated in the left lower lobe concerning for pneumonia . No pleural effusion or pneumothorax is identified . There are no acute osseous abnormalities .
    OUTPUT:
    
Patchy left lower lobe opacity concerning for pneumonia .