Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral radiographs of the chest demonstrate a focal patchy opacity in the mid left lung field that may represent an area of infection . The cardiomediastinal silhouette is normal . There is no pleural effusion or pneumothorax . The pulmonary vascularity is normal .
    OUTPUT:
    
Focal patchy opacity in the mid portion of the left lung that may represent pneumonia .