Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The mediastinal and hilar contours are unremarkable . Pulmonary vasculature is normal . Consolidative opacity within the left lung base is compatible with pneumonia . Right lung is clear . No pleural effusion or pneumothorax is identified . There are no acute osseous abnormalities .
    OUTPUT:
    
Left basilar consolidative opacity concerning for pneumonia . Follow up radiographs after treatment are recommended to ensure resolution of this finding .