Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Chest PA and lateral radiographs demonstrate a faint opacity in the left lower lung obscuring the left hemidiaphragm , likely representing pneumonia . No pleural effusion or pneumothorax evident . Mediastinal , hilar , and cardiac contours are normal . No osseous abnormality noted .
    OUTPUT:
    
Left lower lung opacity concerning for pneumonia .