Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The mediastinal and hilar contours are unchanged . Multiple mediastinal clips are again noted . The pulmonary vascularity is normal . Patchy retrocardiac opacity is re- demonstrated , and likely reflective of the patient 's pneumonia , as demonstrated on the prior CT . Calcified granuloma in the right upper lobe is unchanged . Right lung is otherwise clear . No pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Patchy opacity in the left lower lobe compatible with pneumonia as seen on the prior CT .