Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The aorta remains tortuous and likely dilated , unchanged . The mediastinal and hilar contours are normal . Pulmonary vascularity is unremarkable . Left lower lobe consolidative opacity appears relatively unchanged compared to the prior exam , and is compatible with pneumonia . Right lung is clear . No pneumothorax or pleural effusion is demonstrated . No acute osseous abnormalities seen .
    OUTPUT:
    
Left lower lobe pneumonia . Followup radiographs after treatment are recommended to ensure resolution of this finding .