Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged . There is an extensive new consolidation , predominantly in the left upper lobe , although there is also patchy opacification in the left lower lobe , all suggestive of pneumonia . Elsewhere , the lungs appear clear . There is no pleural effusion or pneumothorax . Bony structures are unremarkable .
    OUTPUT:
    
Findings consistent with pneumonia in the left lung . Follow - up radiographs are recommended in order to ensure resolution and accordingly exclude a mass lesion .