Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiograph demonstrates well expanded lungs . There is no focal consolidation or pleural effusion . No mass or nodule is identified . The heart is top - normal in size . The mediastinal and hilar contours are otherwise within normal limits . The visualized osseous structures are unremarkable . No pneumothorax .
    OUTPUT:
    
No findings to explain leukocytosis .