Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again seen is patchy ill - defined opacity projecting over the left mid to lower lung ; on the lateral view overlying the lingula and possibly the inferior left upper lobe . The right lung remains clear . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
Lingular pneumonia with also possible involvement of the inferior aspect of the left upper lobe .