Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours are unremarkable . There is no pleural effusion or pneumothorax . Opacity in the left lower lung suggests pneumonia ; noting blurring of the left cardiac border , it probably localizes to the lingula .
    OUTPUT:
    
Opacity suggesting pneumonia in the left lower lung , probably in the lingula . Follow - up radiographs are recommended to show resolution in ___ weeks .