Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear stable . There is a new opacity in the left lower lung obscuring the left cardiac border , probably in the lingula for the most part . Elsewhere the lungs remain clear . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Findings suggest pneumonia in the left lower lung , probably in the lingula .