Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are well expanded bilaterally . There is a focal subtle opacity in the right upper lung zone , seen best on the frontal view and may represent pneumonia . Otherwise , lungs are clear bilaterally with no other areas of focal consolidation , no pleural effusion , no masses or lesions . There is no pneumothorax . The cardiomediastinal silhouette is normal . The pleural surfaces are unremarkable .
    OUTPUT:
    
Right upper lung zone focal opacity , which may represent pneumonia .