Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild enlargement of the cardiac silhouette is unchanged . Mediastinal and hilar contours are within normal limits . The pulmonary vasculature is not engorged . Patchy left basilar opacity is concerning for pneumonia . Right lung appears clear . No large pleural effusion or pneumothorax is present . No acute osseous abnormalities are detected .
    OUTPUT:
    
Patchy left basilar opacity concerning for pneumonia . Followup radiographs after treatment are recommended to ensure resolution of this finding .